Operation and Maintenance, Spare Parts edition 05/1994 Serving the Gas Industry - WORLDWIDE 721.20 Safety Shut-Off Valve RMG 721
721_20_gb_9405
Mar 31, 2016
http://www.rmg.com/uploads/myth_download/721_20_gb_9405.pdf
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Operation and Maintenance,Spare Parts edition 05/1994
Serving the Gas Industry - WORLDWIDE
721.20
Safety Shut-Off ValveRMG 721
721.20 p. 2 721.20 p. 15
part no.
material
pos.
no. description
Parts marked by an asterisk * to be kept in stock for maintenance
721.20 p. 14
... steel
... stainless steel
... spring steel
LM
Ms
... light metal
... brass
K
KG
... plastic material
... rubber-like plastic material
4.7 Spare Parts List RMG 721 Mounting unit for RMG 402
Material - key:
St
NSt
FSt
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 500
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 599
00 018 735
00 020 281
00 010 398
00 008 281
10 024 012
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 596
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 502
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 600
00 018 735
00 020 281
00 010 398
00 008 281
10 024 013
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 266
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 502
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 601
00 018 735
00 020 281
00 010 398
00 008 281
10 024 013
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 268
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
50
51
53*
54
57*
58
59
60
61
62
63
64*
65
66*
67
68
69*
70*
71
72
73
74
75
76*
77
78
79*
80*
81
82*
83*
84
85*
86
87*
88*
89
90
sleeve
closing screw
sealing ring
switch valve RMG 919
ball Ø 5 mm
switch gear for 2 ball bearing
two-hole nut
guide cylinder, premounted
SAV connection flange
ring segment
pressure spring
o-ring
nut
valve plate, vulcanized
circlip
valve plate with discharge jet
sealing ring
o-ring
hexagonal screw
disc
pulling rod
cover, complete
engaging socket
o-ring
grooved ball bearing
switch body, premounted
o-ring
o-ring
ring segment
o-ring
o-ring
closing screw
sealing ring
manual releaser
o-ring
ball bearing
pressure spring
valve rod
Ms
St
LM
NSt
LM/St/FSt
St
Ms/St
St
St
FSt
KG
St
LM/KG
FSt
LM
LM
KG
St
St
NSt
LM/St
NSt
KG
St
LM/St
KG
KG
St
KG
KG
St
LM
LM/NSt/Ms/FSt
KG
NSt
FSt
NSt
DN 50,
DN 50/100
DN 80
DN80/150
DN 100
DN 100/200
1. General
Our leaflet 721.00 gives full information with technical data , different versions and dimensions of the safety shut-off
valve (SAV) RMG 721.
Please observe our particular maintenance instructions and spare parts lists for the measuring units of this valve, i.e.
measuring units K 10 a / K 12 / K 13 leaflet 672.20
measuring units K 16 / K 17 leaflet 670.20
Our brochure "General Operating Instructions for Gas Pressure Regulators and Safety Devices" will be useful to fit
the valve into the line, put it into service and find faults that might disturb its operation.
The construction, set-up, supervision and maintenance of gas pressure regulating stations are subject to special
national technical rules which should be strictly observed, for example those given by the german DVGW Worksheets
G 490, G 491, and G 495.
The frequency of periodical maintenance to be foreseen for the safety shut-off valve RMG 711 should be determine
according to the prevailing service conditions and the type and composition of the gaseous medium. We, therefore,
abstain from imposing any fixed intervals and would rather refer you to the recommendations given by the DVGW
Worksheet G 495.
For maintenance all parts are to be cleaned and subjected to a thorough visual inspection. A visual inspection
should not be omitted when the course of operation or performance tests have shown lack of response accuracy.
Particular care should be given to the checking of sealings and diaphragms, as well as of all carrying and movable parts,
engagement and release systems of the tripping and measuring devices and of closing springs.
Damaged parts should be replaced by new ones.
The item numbers referred to in the maintenance instructions are identical with those of the spare parts drawings and
spare parts lists.
We recommend to keep all parts that are specially marked in the spare parts lists in stock for prompt maintenance
availability.
721.20 p. 3
2. Special Operating Instructions
Variation of the adjustment range
To change the adjusted setpoint values for overpressure and/or underpressure release, the force of the setpoint spring
is changed with an adjusting screw.
The permissible adjusted ranges of the set spring are to be cared about.
Opening the safety shut-off valve (SAV)
If the SAV is equipped with a switch for pressure loss, it can only be released if the pressure corresponds to the operation
pressure pa at the measuring point.
The necessary pressure compensation is produced by an automatically opening over the pressure compensation valve
which is integrated in the valve plate.
Moreover, the electromagnets possibly closed must be in the corresponding position for "SAV open".
Beware!
By releasing the version RMG 721 with the control device RMG 672 / K10a, the control device must be first released with a closing cap by pulling, later the SAV can be opened.
721.20 p. 4
Mounting units for RMG 721 DN 50 to DN 100
Push the valve rod in direction to the main valve body.
Moreover, a cap (31) and the corresponding auxiliary
tool (screwpull) can be used as lever.
Push SLOWLY, and wait for the pressure compensation,
put the valve rod until the stop and let it slowly glide.
The SAV is opened and released (drawing 1)
Mounting units for RMG 721 DN 150
Put the manual wheel (126) into the valve rod line (125)
By turning the manual wheel slowly left (wait for the pressure
compensation), put the valve rod (105) until the stop and let
it slowly glide. The SAV is opened and released.
Beware!
To assure the function of the SAV and to avoid
damages of the valve rod, the manual wheel must be
absolutely taken out of the valve rode line after the
opening procedure and hung onto the lever (111).
(see p. 9).
Mounting unit for RMG 402
By turning the sleeve slowly left (50), the valve
pressure compensation of the SAV is activated.
Pull the sleeve until the stop and let
it slowly glide.
The SAV is opened and released (drawing 2).
Beware!
To assure the function of the SAV and to avoid
damages, the sleeve must absolutely screwed
in the threaded line after the opening procedure.
valve rod (25)
cap (31)
Drawing 1: RMG 721 DN 50 - DN 100
Drawing 2: RMG 402 with SAV-system 721
sleeve (50)
721.20 p. 12 721.20 p. 5
pos.no.
13
110
torque M in Nmpipe size DN
A
lubricants
silicone grease
high pessure grease
use (grease slightly the parts)
o-rings (all)
guiding range of the valve rod
engaging balls and sockets
screw connection and fastening screws
Torque
50
44
80
120
100
120
150
30
part no.
00 027 081
00 027 058
Lubricants
3. Special Maintenance Instructions
• Control devices
The SAV must be unreleased when dismantling. The release works automatically for devices with pressure
loss release (normal type).
• Valve rode (25, 90, 105)
The valve rod must be easily moved. When damages occur (f.i. material break or formation of
acute corners), the valve rod must be changed.
• Engaging socket (46, 75, 102)
With damages on the switch side (f.i. material break) this mounting unit must be changed.
• Valve plate (24, 68, 119)
By setting the o-ring (23, 83, 117) in the groove of the valve plate please do as following:
- put the greased o-ring on the seat groove and press it regularly in several places of the ring.
- then press the o-ring completely into the groove.
part no.
Parts marked by an asterisk * to be kept in stock for maintenance
materialpos.
no. description
... steel
... spring steel
LM
Ms
...light metal
... brass
K
KG
... plastic material
... rubber-like plastic material
Spare Parts List RMG 721 DN 150
Material - key:
St
FSt
139
140*
141
142
143
144
145
146*
148
FSt
LM/KG
K
St
St
St
LM
Ms
10 008 575
10 008 609
00 026 550
00 008 279
00 003 399
10 022 947
00 030 142
00 018 684
10 008 604
pressure spring
valve plate, vulcanized
stopper
disc
hexagonal nut
RMG 919
union piece
for installation of K 10a, K 12 and K 13 only for superior
response pressure (special feature without safety against
diaphragm rupture)
sealing ring
closing screw
721.20 p. 6 721.20 p. 11
pos.
no. description part no.
Parts marked by an asterisk * to be kept in stock for maintenance
material
... steel
... stainless steel
... spring steel
LM
Ms
AlBz
...light metal
... brass
... bronze aluminium
K
KG
GS
... plastic material
... rubber-like plastic material
... cast steel
4.5 Spare Part List RMG 721 DN 150
Material - key:
St
NSt
FSt
101
102*
103
104
105*
106*
107*
108
109
110
111
112*
113*
114
115
116
117*
118
119*
120
-
-
-
-
121*
122*
123
124
125
126
127
128
129
130
131
132*
133*
134
135
136
137
138
cover, complete
engaging socket for 2 ball bearing, premounted
switch bearing
switch gear
valve rod
o-ring
o-ring
ring segment
SAV connection flange
hexagonal nut
huke for manual wheel
o-ring
o-ring
nut
circlip
ring segment
o-ring
o-ring
valve plate with discharge jet
body, alternatively:
PN 16
PN 40 (25)
ANSI 150
ANSI 300
o-ring
o-ring
tube ring
threaded screw
valve rod guide, premounted
engaging manual wheel, complete
cap
hexagonal screw
disc
cylinder screw
grooved ball bearing
o-ring
ball
two-hole nut
guide cylinder, premounted
cylinder dowel pin
safety disc
pin screw
LM/FSt
St
LM/St/FSt
LM
NSt
KG
KG
St
St
St
St
KG
KG
NSt
FSt
St
KG
KG
LM
GS
GS
GS
GS
KG
KG
KG
St
LM/KG/St
St
K
St
St
St
St
KG
St
St
AlBz
St
St
St
10 008 784
10 008 787
10 008 771
10 008 778
10 008 780
00 020 513
00 020 238
10 008 570
10 008 506
00 013 120
10 008 668
00 020 541
00 020 380
10 008 615
00 019 137
10 007 589
00 020 539
00 020 323
10 008 602
10 008 473
10 008 476
10 008 478
10 023 435
00 020 380
00 020 293
10 008 617
00 012 324
10 008 516
10 008 681
00 026 363
00 010 112
00 008 281
00 008 176
00 026 236
00 020 320
00 005 108
10 008 761
10 008 781
00 017 101
00 014 114
00 012 212
4. Spare Parts4.1 Spare Parts Drawing RMG 721 DN 50 - DN 100
*) to be kept in stock for maintenance
part E
part F
sectional view A-Atension sleevein cover (belong to pos. 48)
sectional view B-B
switch gear unreleasedswitch gear released
721.20 p. 10 721.20 p. 7
pos.
no. description
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
... cast steel
LM
Ms
Al
GGG
... light metal
... brass
... aluminium
... spheroidal graphite cast iron
K
KG
AlBz
... plastic material
... rubber-like plastic material
... aluminium bronze
Material - key:
St
NSt
FSt
GS
part no.
material
4.2 Spare Parts List RMG 721 DN 50 - DN 100
11
12*
13
14
15
16*
-
17
-
-
-
-
-
-
-
-
18
19
20*
21*
22*
23*
-
-
24*
25*
26
27
28
29
30
31
32*
33
34
35
36
37
38
39*
40
41
switch body premounted
o-ring
hexagonal screw
safety ring
SAV connection flange
o-ring
o-ring
body alternatively:
PN 40
PN 40
PN 40
PN 25
PN 16
PN 16
ANSI 150
ANSI 300
hexagonal nut
ring segment
Seeger circlip
o-ring
valve plate (vulcanized)
o-ring
o-ring
o-ring
valve plate with discharge jet
valve rod
tube ring
rod screw
safety screw
hexagonal nut
cap for valve rod
cap
o-ring
KAPSTO screw stopper
receiving cap for test release
valve cap guide premounted
spring auxiliary piece
pressure spring
ring segment
o-ring
guide cylinder premounted
two-hole nut
10 008749
00 020 413
00 010 032
00 014 113
10 008 500
00 020 246
-
10 008 462
-
-
10 008 462
10 008 462
-
10 008 463
10 023 430
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
00 020 596
-
-
10 008 599
10 008 494
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
-
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
DN 50 DN 80 DN 100
LM/FSt
KG
St
FSt
GGG
KG
KG
GS
GGG
GGG
GS
GS
GGG
GS
GS
NSt
St
FSt
KG
LM/KG
KG
KG
KG
LM
NSt
KG
St
St
St
LM
LM
KG
K
Ms
St/LM/KG
LM
FSt
St
KG
ALBz/Ms/KG
St
10 008 749
00 020 413
00 010 445
00 014 115
10 008 502
-
00 020 427
10 008 465
10 008 427
-
10 008 465
10 008 465
-
10 008 466
10 023 431
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
-
00 020 268
-
10 008 601
10 008 497
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
10 008 641
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
10 008 749
00 020 413
00 010 445
00 014 115
10 008 502
-
00 020 427
10 008 468
-
10 008 429
10 008 468
10 008 467
10 008 437
10 008 469
10 023 433
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
-
-
00 020 268
10 008 601
10 008 497
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
10 008 641
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
4.4 Spare Parts Drawing RMG 721 DN 150
*) to be kept in stock for maintenance
sectional view C-C
721.20 p. 8 721.20 p. 9
pos.
no. description
part no.
material
4.3 Spare Parts List RMG 721, Mounting unit RMG 408 DN 50/100, DN 80/150, DN 100/200
13
14
23
24
25
55
hexagonal screw
safety disc
o-ring
valve plate with discharge jet
valve rod
tube protection cap
00 005 692
00 014 113
-
-
10 008 494
00 026 363
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
LM
KG
... light metal
... rubber-like plastic material
Material - key:
St
NSt
FSt
DN 50/100 DN 80/100 DN 100/200
St
FSt
KG
LM
NSt
KG
00 013 120
00 014 114
00 020266
10 008 600
10 008 495
00 026 363
00 013 120
00 014 114
-
-
10 008 496
00 026 363
pos.
no. description
part no.
material
Spare Parts List RMG 721 DN 50 - DN 100
42
43
44*
45
46
47
48
49
50
51
52
53
54*
55
56*
57
58
59*
switch bearing for prem. ball bearing
grooved ball bearing
o-ring
ball
engaging socket
cylinder screw
cover, complete
disc
hexagonal disc
closing screw
sealing ring
manual releaser, complete
o-ring
tube protection cap
o-ring
RMG 919
union piece
for construction of K10a, K12
and K13 only superior
response pressure
(special feature without protection
against diaphragm rupture)
sealing ring
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
LM
Ms
... light metal
... brass
K
KG
... plastic material
... rubber-like plastic materail
Material - key:
St
NSt
FSt
DN 50 DN 80 DN 100
LM/St/FSt
St
KG
St
St
St
LM/ FSt
St
St
St
St
LM/FSt NSt/Ms
KG
K
KG
St
LM
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
721.20 p. 8 721.20 p. 9
pos.
no. description
part no.
material
4.3 Spare Parts List RMG 721, Mounting unit RMG 408 DN 50/100, DN 80/150, DN 100/200
13
14
23
24
25
55
hexagonal screw
safety disc
o-ring
valve plate with discharge jet
valve rod
tube protection cap
00 005 692
00 014 113
-
-
10 008 494
00 026 363
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
LM
KG
... light metal
... rubber-like plastic material
Material - key:
St
NSt
FSt
DN 50/100 DN 80/100 DN 100/200
St
FSt
KG
LM
NSt
KG
00 013 120
00 014 114
00 020266
10 008 600
10 008 495
00 026 363
00 013 120
00 014 114
-
-
10 008 496
00 026 363
pos.
no. description
part no.
material
Spare Parts List RMG 721 DN 50 - DN 100
42
43
44*
45
46
47
48
49
50
51
52
53
54*
55
56*
57
58
59*
switch bearing for prem. ball bearing
grooved ball bearing
o-ring
ball
engaging socket
cylinder screw
cover, complete
disc
hexagonal disc
closing screw
sealing ring
manual releaser, complete
o-ring
tube protection cap
o-ring
RMG 919
union piece
for construction of K10a, K12
and K13 only superior
response pressure
(special feature without protection
against diaphragm rupture)
sealing ring
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
LM
Ms
... light metal
... brass
K
KG
... plastic material
... rubber-like plastic materail
Material - key:
St
NSt
FSt
DN 50 DN 80 DN 100
LM/St/FSt
St
KG
St
St
St
LM/ FSt
St
St
St
St
LM/FSt NSt/Ms
KG
K
KG
St
LM
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
10 008 771
00 026 236
00 020 320
00 005 108
10 008 765
00 008 176
10 008 763
00 008 281
00 010 398
00 026 175
00 018 689
10 001 179
00 020 310
00 026 363
00 020 432
10 022 947
00 030 142
00 018 684
721.20 p. 10 721.20 p. 7
pos.
no. description
Parts marked by an asterisk * to be kept in stock for maintenance
... steel
... stainless steel
... spring steel
... cast steel
LM
Ms
Al
GGG
... light metal
... brass
... aluminium
... spheroidal graphite cast iron
K
KG
AlBz
... plastic material
... rubber-like plastic material
... aluminium bronze
Material - key:
St
NSt
FSt
GS
part no.
material
4.2 Spare Parts List RMG 721 DN 50 - DN 100
11
12*
13
14
15
16*
-
17
-
-
-
-
-
-
-
-
18
19
20*
21*
22*
23*
-
-
24*
25*
26
27
28
29
30
31
32*
33
34
35
36
37
38
39*
40
41
switch body premounted
o-ring
hexagonal screw
safety ring
SAV connection flange
o-ring
o-ring
body alternatively:
PN 40
PN 40
PN 40
PN 25
PN 16
PN 16
ANSI 150
ANSI 300
hexagonal nut
ring segment
Seeger circlip
o-ring
valve plate (vulcanized)
o-ring
o-ring
o-ring
valve plate with discharge jet
valve rod
tube ring
rod screw
safety screw
hexagonal nut
cap for valve rod
cap
o-ring
KAPSTO screw stopper
receiving cap for test release
valve cap guide premounted
spring auxiliary piece
pressure spring
ring segment
o-ring
guide cylinder premounted
two-hole nut
10 008749
00 020 413
00 010 032
00 014 113
10 008 500
00 020 246
-
10 008 462
-
-
10 008 462
10 008 462
-
10 008 463
10 023 430
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
00 020 596
-
-
10 008 599
10 008 494
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
-
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
DN 50 DN 80 DN 100
LM/FSt
KG
St
FSt
GGG
KG
KG
GS
GGG
GGG
GS
GS
GGG
GS
GS
NSt
St
FSt
KG
LM/KG
KG
KG
KG
LM
NSt
KG
St
St
St
LM
LM
KG
K
Ms
St/LM/KG
LM
FSt
St
KG
ALBz/Ms/KG
St
10 008 749
00 020 413
00 010 445
00 014 115
10 008 502
-
00 020 427
10 008 465
10 008 427
-
10 008 465
10 008 465
-
10 008 466
10 023 431
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
-
00 020 268
-
10 008 601
10 008 497
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
10 008 641
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
10 008 749
00 020 413
00 010 445
00 014 115
10 008 502
-
00 020 427
10 008 468
-
10 008 429
10 008 468
10 008 467
10 008 437
10 008 469
10 023 433
10 008 614
10 008 612
00 019 127
00 020 412
10 008 606
-
-
00 020 268
10 008 601
10 008 497
10 008 620
00 012 324
00 014 123
00 003 399
10 008 579
10 008 581
00 020 281
00 026 550
10 008 580
10 008 572
10 008 641
10 008 577
10 007 589
00 020 383
10 008 756
10 008 761
4.4 Spare Parts Drawing RMG 721 DN 150
*) to be kept in stock for maintenance
sectional view C-C
721.20 p. 6 721.20 p. 11
pos.
no. description part no.
Parts marked by an asterisk * to be kept in stock for maintenance
material
... steel
... stainless steel
... spring steel
LM
Ms
AlBz
...light metal
... brass
... bronze aluminium
K
KG
GS
... plastic material
... rubber-like plastic material
... cast steel
4.5 Spare Part List RMG 721 DN 150
Material - key:
St
NSt
FSt
101
102*
103
104
105*
106*
107*
108
109
110
111
112*
113*
114
115
116
117*
118
119*
120
-
-
-
-
121*
122*
123
124
125
126
127
128
129
130
131
132*
133*
134
135
136
137
138
cover, complete
engaging socket for 2 ball bearing, premounted
switch bearing
switch gear
valve rod
o-ring
o-ring
ring segment
SAV connection flange
hexagonal nut
huke for manual wheel
o-ring
o-ring
nut
circlip
ring segment
o-ring
o-ring
valve plate with discharge jet
body, alternatively:
PN 16
PN 40 (25)
ANSI 150
ANSI 300
o-ring
o-ring
tube ring
threaded screw
valve rod guide, premounted
engaging manual wheel, complete
cap
hexagonal screw
disc
cylinder screw
grooved ball bearing
o-ring
ball
two-hole nut
guide cylinder, premounted
cylinder dowel pin
safety disc
pin screw
LM/FSt
St
LM/St/FSt
LM
NSt
KG
KG
St
St
St
St
KG
KG
NSt
FSt
St
KG
KG
LM
GS
GS
GS
GS
KG
KG
KG
St
LM/KG/St
St
K
St
St
St
St
KG
St
St
AlBz
St
St
St
10 008 784
10 008 787
10 008 771
10 008 778
10 008 780
00 020 513
00 020 238
10 008 570
10 008 506
00 013 120
10 008 668
00 020 541
00 020 380
10 008 615
00 019 137
10 007 589
00 020 539
00 020 323
10 008 602
10 008 473
10 008 476
10 008 478
10 023 435
00 020 380
00 020 293
10 008 617
00 012 324
10 008 516
10 008 681
00 026 363
00 010 112
00 008 281
00 008 176
00 026 236
00 020 320
00 005 108
10 008 761
10 008 781
00 017 101
00 014 114
00 012 212
4. Spare Parts4.1 Spare Parts Drawing RMG 721 DN 50 - DN 100
*) to be kept in stock for maintenance
part E
part F
sectional view A-Atension sleevein cover (belong to pos. 48)
sectional view B-B
switch gear unreleased switch gear released
721.20 p. 12 721.20 p. 5
pos.no.
13
110
torque M in Nmpipe size DN
A
lubricants
silicone grease
high pessure grease
use (grease slightly the parts)
o-rings (all)
guiding range of the valve rod
engaging balls and sockets
screw connection and fastening screws
Torque
50
44
80
120
100
120
150
30
part no.
00 027 081
00 027 058
Lubricants
3. Special Maintenance Instructions
• Control devices
The SAV must be unreleased when dismantling. The release works automatically for devices with pressure
loss release (normal type).
• Valve rode (25, 90, 105)
The valve rod must be easily moved. When damages occur (f.i. material break or formation of
acute corners), the valve rod must be changed.
• Engaging socket (46, 75, 102)
With damages on the switch side (f.i. material break) this mounting unit must be changed.
• Valve plate (24, 68, 119)
By setting the o-ring (23, 83, 117) in the groove of the valve plate please do as following:
- put the greased o-ring on the seat groove and press it regularly in several places of the ring.
- then press the o-ring completely into the groove.
part no.
Parts marked by an asterisk * to be kept in stock for maintenance
materialpos.
no. description
... steel
... spring steel
LM
Ms
...light metal
... brass
K
KG
... plastic material
... rubber-like plastic material
Spare Parts List RMG 721 DN 150
Material - key:
St
FSt
139
140*
141
142
143
144
145
146*
148
FSt
LM/KG
K
St
St
St
LM
Ms
10 008 575
10 008 609
00 026 550
00 008 279
00 003 399
10 022 947
00 030 142
00 018 684
10 008 604
pressure spring
valve plate, vulcanized
stopper
disc
hexagonal nut
RMG 919
union piece
for installation of K 10a, K 12 and K 13 only for superior
response pressure (special feature without safety against
diaphragm rupture)
sealing ring
closing screw
721.20 p. 13
4.6 Spare Parts Drawing RMG 721 Mounting unit for RMG 402
*) Parts to be kept in stock for maintenance
sectional view B-B sectional view A
switch gear unreleased switch gear released
part no.
material
pos.
no. description
Parts marked by an asterisk * to be kept in stock for maintenance
721.20 p. 14
... steel
... stainless steel
... spring steel
LM
Ms
... light metal
... brass
K
KG
... plastic material
... rubber-like plastic material
4.7 Spare Parts List RMG 721 Mounting unit for RMG 402
Material - key:
St
NSt
FSt
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 500
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 599
00 018 735
00 020 281
00 010 398
00 008 281
10 024 012
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 596
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 502
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 600
00 018 735
00 020 281
00 010 398
00 008 281
10 024 013
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 266
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
18 352 362
00 026 914
00 018 684
10 022 947
00 005 108
10 008 771
10 008 761
10 008 756
10 008 502
10 007 589
10 008 577
00 020 432
10 008 614
10 008 606
00 019 127
10 008 601
00 018 735
00 020 281
00 010 398
00 008 281
10 024 013
18 352 364
10 008 765
00 020 320
00 026 236
10 008 749
00 020 413
00 020 383
10 008 612
00 020412
00 020 268
00 026 175
00 018 589
10 001 179
00 020 310
00 003 055
10 001 187
10 021 926
50
51
53*
54
57*
58
59
60
61
62
63
64*
65
66*
67
68
69*
70*
71
72
73
74
75
76*
77
78
79*
80*
81
82*
83*
84
85*
86
87*
88*
89
90
sleeve
closing screw
sealing ring
switch valve RMG 919
ball Ø 5 mm
switch gear for 2 ball bearing
two-hole nut
guide cylinder, premounted
SAV connection flange
ring segment
pressure spring
o-ring
nut
valve plate, vulcanized
circlip
valve plate with discharge jet
sealing ring
o-ring
hexagonal screw
disc
pulling rod
cover, complete
engaging socket
o-ring
grooved ball bearing
switch body, premounted
o-ring
o-ring
ring segment
o-ring
o-ring
closing screw
sealing ring
manual releaser
o-ring
ball bearing
pressure spring
valve rod
Ms
St
LM
NSt
LM/St/FSt
St
Ms/St
St
St
FSt
KG
St
LM/KG
FSt
LM
LM
KG
St
St
NSt
LM/St
NSt
KG
St
LM/St
KG
KG
St
KG
KG
St
LM
LM/NSt/Ms/FSt
KG
NSt
FSt
NSt
DN 50,
DN 50/100
DN 80
DN80/150
DN 100
DN 100/200
1. General
Our leaflet 721.00 gives full information with technical data , different versions and dimensions of the safety shut-off
valve (SAV) RMG 721.
Please observe our particular maintenance instructions and spare parts lists for the measuring units of this valve, i.e.
measuring units K 10 a / K 12 / K 13 leaflet 672.20
measuring units K 16 / K 17 leaflet 670.20
Our brochure "General Operating Instructions for Gas Pressure Regulators and Safety Devices" will be useful to fit
the valve into the line, put it into service and find faults that might disturb its operation.
The construction, set-up, supervision and maintenance of gas pressure regulating stations are subject to special
national technical rules which should be strictly observed, for example those given by the german DVGW Worksheets
G 490, G 491, and G 495.
The frequency of periodical maintenance to be foreseen for the safety shut-off valve RMG 711 should be determine
according to the prevailing service conditions and the type and composition of the gaseous medium. We, therefore,
abstain from imposing any fixed intervals and would rather refer you to the recommendations given by the DVGW
Worksheet G 495.
For maintenance all parts are to be cleaned and subjected to a thorough visual inspection. A visual inspection
should not be omitted when the course of operation or performance tests have shown lack of response accuracy.
Particular care should be given to the checking of sealings and diaphragms, as well as of all carrying and movable parts,
engagement and release systems of the tripping and measuring devices and of closing springs.
Damaged parts should be replaced by new ones.
The item numbers referred to in the maintenance instructions are identical with those of the spare parts drawings and
spare parts lists.
We recommend to keep all parts that are specially marked in the spare parts lists in stock for prompt maintenance
availability.
721.20 p. 3
2. Special Operating Instructions
Variation of the adjustment range
To change the adjusted setpoint values for overpressure and/or underpressure release, the force of the setpoint spring
is changed with an adjusting screw.
The permissible adjusted ranges of the set spring are to be cared about.
Opening the safety shut-off valve (SAV)
If the SAV is equipped with a switch for pressure loss, it can only be released if the pressure corresponds to the operation
pressure pa at the measuring point.
The necessary pressure compensation is produced by an automatically opening over the pressure compensation valve
which is integrated in the valve plate.
Moreover, the electromagnets possibly closed must be in the corresponding position for "SAV open".
Beware!
By releasing the version RMG 721 with the control device RMG 672 / K10a, the control device must be first released with a closing cap by pulling, later the SAV can be opened.
721.20 p. 2 721.20 p. 15
The RMG Group of Companies on the internet: http://www.rmg.de
We supply you with productsfor gas pressure regulation:
We reserve the right for technical changesServing the Gas Industry - WORLDWIDE
The other RMG Companies:
Bryan Donkin RMG Gas Controls Ltd.Enterprise Drive, Holmewood, Chesterfield S42 5UZ, EnglandTelephone (++44) 1246 501-501 • Fax (++44) 1246 501-500gas pressure regulating equipment, below ground gas control modules
RMG REGEL + MESSTECHNIK GMBHOsterholzstrasse 45, D-34123 Kassel, GermanyTelephone (++49) 561 5007-0 • Fax (++49) 561 5007-107
gas pressure regulators and safety devices
RMG-GASELAN Regel + Meßtechnik GmbHJulius-Pintsch-Ring 3, D-15517 Fürstenwalde, GermanyTelephone (++49) 3361 356-60 • Fax (++49) 3361 356-836gas pressure regulating equipment, displacement meters, complete stations
RMG Messtechnik GmbHOtto-Hahn-Strasse 5, D-35510 Butzbach, GermanyTelephone (++49) 6033 897-0 • Fax (++49) 6033 897-130turbine meters, vortex meters, correctors, flow computers, odorizers
WÄGA Wärme-Gastechnik GmbHOsterholzstrasse 45, D-34123 Kassel, GermanyTelephone (++49) 561 5007-0 • Fax (++49) 561 5007-207design and assembly of gas pressure regulating and metering stations
Bryan Donkin RMG Co. of Canada Ltd.50 Clarke Street South, Woodstock, Ontario N4S 7Y5, CanadaTelephone (++1) 519 5398531 • Fax (++1) 519 5373339domestic regulators and safety devices
Karl Wieser GmbHAnzinger Strasse 14, D-85560 Ebersberg, GermanyTelephone (++49) 8092 2097-0 • Fax (++49) 8092 2097-10
Heinrich-Lanz-Strasse 9, D-67259 Beindersheim/Pfalz, GermanyTelephone (++49) 6233 3762-0 • Fax (++49) 6233 3762-40 data logging, monitor systems, danger alarm systems
Betriebsstelle Beindersheim