SP-1470-C Like getting two pumps in one! DOUBLE PUMPS VIKING – BUILT OUBLE PUMPS P M M U U U U P P E E L L B UB U UB U U D D DOUBLE PUMPS DOUBLE PUMPS DOUBLE PUMPS DOUBLE PUMPS DOUBLE PUMPS DOUBLE PUMPS S S S S P P P P M M M M U U U U P P P P E E E E LE LE LE LE B B B B U U U U D D D D B B B B P P P P P P P P O O O O D D D D M M BLE PUM BLE PUM B B S S D D PS P M M M M M M PU P E E LE LE UB UB OU PS PS PS PS DOU DOU DOU DOU PS PS PS PS M M M M U U U U U U U U PU PU PU PU E E E E LE LE LE LE BL BL UBL UBL UB UB UB UB U U U U DO DO DO DO P P P P P P P P B B B B O O O O D D D D M M M M M M M M B B B B O O Viking double pumps are ideally suited to many applications in the industrial and mobile markets. Two independent pumping units are operated from a single power source to reduce equipment costs and simplify installation. System flexibility is maintained as each pumping unit can be operated at a different pressure without affecting the other. A total of 96 different double pump combinations are available to match your requirements. A special version of the double pump has an integral hi-lo circuit. This arrangement has the advantage of providing a fast cycle time and at the same time reduces the HP required by unloading the high volume pump when it is not needed. A double pump with an integral hi-lo circuit basically consists of a high volume and low volume set of pumping elements, a built-in unloading valve and a built-in check valve. The hydraulic circuit is arranged to provide rapid advance, feed and rapid return. The total volume from both sets of pumping elements is delivered until the work load is contacted. At this point, system pressure increases causing the unloading valve to function. Flow from the high volume set of pumping elements is directed back to the suction side of the pump at minimum pressure. The low volume set of pumping elements continues to deliver flow for the high pressure feed part of the operation. Both sets of pumping elements deliver flow on the return stroke. VIKING PUMP
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Viking double pumps are ideally suited to many applications in the industrial and mobile markets. Two independent pumping units are operated from a single power source to reduce equipment costs and simplify installation. System flexibility is maintained as each pumping unit can be operated at a different pressure without affecting the other. A total of 96 different double pump combinations are available to match your requirements.
A special version of the double pump has an integral hi-lo circuit. This arrangement has the advantage of providing a fast cycle time and at the same time reduces the HP required by unloading the high volume pump when it is not needed.
A double pump with an integral hi-lo circuit basically consists of a high volume and low volume set of pumping elements, abuilt-in unloading valve and a built-in check valve. The hydrauliccircuit is arranged to provide rapid advance, feed and rapid return. The total volume from both sets of pumping elements is delivered until the work load is contacted. At this point, system pressure increases causing the unloading valve to function. Flow from the high volume set of pumping elements is directed back to the suction side of the pump at minimum pressure. The low volume set of pumping elements continues to deliver flow for the high pressure feed part of the operation. Both sets of pumping elements deliver flow on the return stroke.
* FOR TOTAL PUMP CAPACITY ADD THE GPM RATING OF EACH SECTION:(1825 = 0.7 + 1.0 for TOTAL of 1.7 GPM @ 1750 GPM)† COUNTERCLOCKWISE ROTATION NOT AVAILABLE FOR DESIGN SERIES C
SPECIFICATIONS
DOUBLE PUMP MODEL NUMBERING CODE
SHAFT ROTATION(VIEWED FROM SHAFT END)O = CLOCKWISE1 = COUNTER CLOCKWISE†
G = HEAVY DUTY
H = HEAVY-DUTY WITH HI-LO CIRCUIT
*SECOND PUMP CAPACITY (LARGER)
PUMPSECTION
NOMINAL CAPACITY@ 1750 RPM DISPLACEMENT MAXIMUM SPEED
To determine whether a pump is rated for continuousor intermittent duty, use Figures 2, 3 and/or 4 to arrive at the number of units for each pumping section. These values should be based on the maximum pressure expected from each pumping section during simultaneous operations. Add the units for each pumping section together. Use this total number of units and Figure 1 to arrive at a service cycle rating.
EXAMPLE: GP-052510 with the 25 section at 1500 PSIG and the 10 section at 200 PSIG. Figure 3 shows the 25 section yields 88 units and the 10 section yields 50 units, a total of 138 units. Figure 1 shows that the pump is rated for continuous duty.
FIGURE 1SERVICE CYCLE TOTAL UNITS
Continuous150 Maximum GP-04 and GP-05
1050 Maximum GP-07
Intermittent300 Maximum GP-04 and GP-05
2100 Maximum GP-07
FIGURE 2
FIGURE 3
FIGURE 4
The solid portion of each pump section line indicates the continuous operation parameters of that pump section.
The dashed portion indicates the intermittent parameters.
Figures 5, 6, 7, 8, 9 and 10 relate required horsepower to discharge pressure for each pump section. Total horsepower required for the double pump is found by adding the requirements for each pump section.
EXAMPLE: Using the pump from the first example (page 3) operating at 1750 RPM (Figure 7), the 25 section yields a horsepower requirement of 1.1 and the 10 section yields a requirement of 0.6. Total horsepower required is 1.7.
STANDARD CONSTRUCTIONQuality materials and precision manufacturing are used in every pump with the following materials as standard:■ Head, Casing and Bracket — cast iron■ Gears — Heat-treated steel (GP-04 and GP-07) — Heat-treated powder metal (GP-05)■ Shafts — Case hardened steel■ Bearings — Anti-friction, needle■ O-Rings and Lip Seal — Buna-NFor variations of the above construction, consult the factory for price and delivery.
ROTATIONThe double pumps are directional, and rotational information (viewed from shaft end) is essential. If rotation information is omitted from an order, the pump will be furnished with clockwise rotation. A bi-directional rotation feature is available as an option.
DISCHARGE PRESSUREThe hydraulic gear pumps are especially designed for operating many types of hydraulic equipment which require pressures up to 2500 PSI with intermittent service.
INLET PRESSURESizing the inlet piping so the fluid velocity is less than 5 ft./sec. will insure satisfactory operation of the pump. Positive inlet pressure is limited to 15 PSI maximum.
TEMPERATURE RANGEThe Viking hydraulic gear pump will function properly up to a maximum of 225°F. The recommended operating temperature for hydraulic service is between 50° and 150°F.
HYDRAULIC OILThe best performance can be obtained by utilizing an industrial grade hydraulic oil. Operating viscosity should be between 100 and 300 SSU. Temperature should not exceed 150°F. for optimum life of the hydraulic oil.
PUMP LIFEPump life is a factor of many parameters, mainly pressure, speed and duty cycle. Temperature, contamination and type of hydraulic oil also have a definite effect. For actual life expectancy, consult the factory with specific conditions.
FILTERTo extend maximum pump life and insure the highest pump operating efficiency, keep the system clean and free of contaminating elements. On a hydraulic system it is recommended that a return line filter be installed having a maximum of 10 micron rating.
FACTORY TESTINGEvery pump is performance tested. In addition, each pump is backed by a full factory warranty.
OPTIONAL CONSTRUCTION FEATURESContact our sales department for recommendations and special construction features available. In addition to the model number, all options must be specified in writing on the order.
APPLICATION INFORMATIONTo assist us in supplying a pump which will provide optimum service, the following information should be furnished: capacity needed, discharge pressure, inlet conditions, name of fluid, viscosity and operating temperature.
FOOT-BRACKET MOUNTEDA sturdy cast iron bracket, cast and machined by Viking, assures accurate fit with the pump. Mountings are available for all sizes of Double and Hi-Lo Double pumps.
C-FLANGE MOTOR MOUNTED UNITViking Double and Hi-Lo Double pumps in combination Viking Double and Hi-Lo Double pumps in combination with the Nema “C” flange bracket and flexible with the Nema “C” flange bracket and flexible coupling provide an easily assembled, compact unit. coupling provide an easily assembled, compact unit. The cast iron adapter bracket is accurately machined The cast iron adapter bracket is accurately machined for precise shaft alignment.
FOUR-BOLT MOTOR MOUNTED UNITIntegral pump and motor units help reduce on-site assembly costs and provide maximum compactness where space is at a premium. The 4-bolt mounting can be provided with AC or DC motors. Available for Series GP-04 and GP-05 only.
GP-05 “B” DRIVEGP-05 “B” DRIVE
GP-07 “M” DRIVE
GP-04 & GP-05 “M4” DRIVE
MOUNTING OPTIONS
GP-07 “B” DRIVE
Viking Double and Hi-Lo Double pumps offer efficient gear set combinations allowing maximum pressure with minimum horsepower. Hi-Lo Double pumps include a highly-efficient sequencing valve and a heat-treated guided poppet check valve.