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To prevent this condition from continuing, the small orifice meters the fluid trapped in the load back through the flat cut-off compensator spool to case drain. The actuator load pressure will decrease gradually causing the load sensing spool to open pressure to the yoke stroking piston, bypassing the flat cut-off compensator. As the actuator load pressure reduces, the pump outlet pressure will reduce until minimum pump pressure is obtained. When the minimum flow/minimum pressure condition occurs, the pump is considered to be in standby. During standby, the CVP(C) control reduces the input power well below that of a standard “C” type compensator. This provides an increase in system efficiency and reduces the cost of operation. Compensator Spring Drain Compensator Spool Yoke Stroking Piston Rotating Group Yoke Spring Inlet Outlet Actuator Load External Valve Spool Orifice Load Sensing Spool Set Screw Compensator Spring Drain Compensator Spool Yoke Stroking Piston Rotating Group Yoke Spring Inlet Outlet Actuator Load External Valve Spool Orifice Load Sensing Spool Set Screw Section IV – Installation and Operating Instructions A. Installation Drawings The installation drawing listed in Table 2 will show installation dimensions and port locations. B. Mounting and Drive Connections CAUTION Pump shafts are designed to be installed in couplings with a slip fit. Pounding can injure the bearings. Shaft tolerances are shown on the installation drawing. (See Table 1.) 1. Direct Mounting - A pilot on the pump mounting flange (Figure 6) assures correct mounting and shaft alignment. Make sure the pilot is firmly seated in the accessory pad of the power source. Care should be exercised in tightening the mounting screw to prevent misalignment. 2. Indirect drive is not recommended for these pumps without engineering approval. Figure 6. Pump Pilot Flange. C. Shaft Rotation Rotation is determined as viewed from the shaft end of the pump. A pump made for left-hand rotation is identified by an ”L” and right-hand by an ”R” in the model code. (See Table 2.) An arrow stamped on the mounting flange indicates the correct rotation. CAUTION NEVER drive a pump in the wrong direction of rotation. Seizure may result causing expensive repairs. D. Piping and Tubing 1. All pipes and tubing must be thoroughly cleaned before installation. Recommended methods of cleaning are sand blasting, wire brushing, and pickling. NOTE For instructions on pickling, refer to instructions sheet 1221-S. 2. To minimize flow resistance and the possibility of leakage, only as many fittings and connections as are necessary for proper installation should be used. 3. The number of bends in tubing should be kept to a minimum to prevent excessive turbulence and friction of oil flow. Tubing must not be bent too sharply. The recommended radius for bends is three times the inside diameter of the tube. E. Hydraulic Fluid Recommendations General Data Oil in a hydraulic system performs the dual function of lubrication and transmission of power. It constitutes a vital factor in a hydraulic system, and careful selection of it should be made with the assistance of a reputable supplier. Proper selection of oil assures satisfactory life and operation of system components with particular emphasis on hydraulic pumps. Any oil selected for use with pumps is acceptable for use with valves or motors. Data sheets for oil selection are available from any authorized distributor or sales engineer. Oil Recommendations noted in the data sheet are based on our experience in industry as a leading hydraulic component manufacturer. Where special considerations indicate a need to depart from the recommended oils or operating conditions, contact an authorized distributor or sales engineer. Cleanliness Thorough precautions should always be observed to insure the hydraulic system is clean: 1. Clean (flush) entire new system to remove paint, metal chips, welding shot etc. 2. Filter each change of oil to prevent introduction of contaminants into the system. 3. Provide continuous oil filtration to remove sludge and products of wear and corrosion generated during the life of the system. 4. Provide continuous protection of system from entry of airborne contamination, by sealing the system and/or by proper filtration of the air. 5. During usage, proper oil filling and servicing of oil filters, breathers, reservoirs, etc. cannot be over emphasized. 6. Thorough precautions should be taken by proper system and reservoir design to insure that aeration of the oil wIll be kept to a minimum. Sound Level Sound Level Some of the major factors affecting the fluid conditions that cause the loudest noises in a hydraulic system are: 1. Very high viscosities at start-up temperatures can cause pump noises due to cavitation. 2. Running with a moderately high viscosity fluid will impede the release of entrained air. The fluid will not be completely purged of such air in the time it remains in the reservoir before recycl...
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