PZH Series High-Pressure Variable Volume Piston Pump eatures qlong, trouble-free service life Swash plate design ensures long, trouble-free bearing life. wlow-noise, even in the high pressure range High-rigidity semi-cylindrical swash plate provides low-noise operation, PZH SERIES HIGH PRESSURE TYPE VRIBLE DISPLCEMENT XIL PISTON PUMP 28,4cm 3 /rev 41MPa even in the high-pressure range. eemale piston emale piston increases sealing between the shoe and piston for enhanced resistance to contamination. rhigh-precision proportional flow control This load sensitive type pump provides precision low flow rate control from zero load. Specifications Model No. Pump Capacity cm 3 /rev Rated Voltage MPa {kgf/cm 2 } Maximum Working Pressure MPa {kgf/cm 2 } Revolution Speed min 1 Min. Max. Weight kg **5***-1 28 34.3 {35} 41. {418} 5 19 28 PZH-2B-4**5***-1 4 34.3 {35} 41. {418} 5 19 29 Handling Pump Installation and Piping Precautions zuse flexible couplings for connecting the pump shaft to the drive shaft, and minimize radial or thrust load from being applied to the pump shaft. xeccentricity between the drive shaft and pump shaft should be no greater than.5mm, with surface vibration n.9 or less. cmake sure the clamping length of couplings and the hydraulic pump shaft is long enough to allow the entire length of key fits in the coupling width. vuse a sufficiently rigid pump mounting base. bmake the pump suction side pressure is at least.3mpa at peak times, and at least.1mpa normally. nraise part of the drain piping so it is above the topmost part of the pump body, and insert the return section of the drain piping into the hydraulic operating fluid tank. In order to obtain a drain back pressure of.2mpa or less, the drain pipe should have an inside diameter of at least 17 and should be less than one meter long. Management of Hydraulic Operating luid zuse only good-quality hydraulic operating fluid with a kinematic viscosity during operation within the range of 2 to 2 mm 2 /sec. Normally, you should use an R&O type and wear-resistant type of ISO VG46 or equivalent. The optimum kinematic viscosity during operation is 2 to 5 mm 2 /sec. xthe operating temperature range is 1 to 8 C. When the oil temperature at startup is 1 C or less, run the pump at low pressure until the oil temperature reaches 1 C. cprovide a suction strainer with a filtering grade of about 1µm (15 mesh). Provide a return line filter of grade 2µm or less on the return line to the tank. (When the pump is used at a high pressure of 14 MPa or greater, a filter of 1µm or less is recommended.) vmanage the hydraulic operating fluid so that contamination is maintained at class NS9 or lower. buse the hydraulic operating fluid when the operating ambient temperature is in the range of 2 to 2 C. Startup Precautions zbefore starting the pump, fill the pump body with clean hydraulic operating oil through the drain port or the air bleeder port. Be sure to perform the air bleed operation from the air bleeder port before and immediately after running the pump. xthis pump does not have a pressure compensation mechanism (no full cutoff). Be sure to install a relief valve in the circuit. ccheck to make sure that the pump rotation direction is clockwise when viewed from the end of the shaft. vir entering the pump or pipes can cause noise or vibration. t startup, set the pump discharge side to a no-load state, and operate the pump in the inching mode to remove any air that might be in the pump or pipes. bto enable proper flow control when using a proportional flow control model, loosen the air vent of the electro-hydraulic proportional control valve to bleed air from the valve immediately after operation. You can change the position of the air vent by loosening the coil cover. When there is no input current to the valve, you can manually control the flow rate with the manual flow rate. Normally, the manual should be returned completely to its original position and secured with the lock nut. -42
Understanding Model Numbers Standard type Constant horsepower control type (L) PZH 2B 28L5 1 Design number Constant horsepower 5: 5.5 kw, 7: 7.5kW axial input 11: 11 kw, 15: 15.5kW 18: 18.5kW, 22: 22 kw 3: 3 kw, 37: 37 kw Revolution speed : 15min 1, B: 18min 1 Rated voltage 5: to 35.MPa {357kgf/cm 2 } low rate r /min P-Q characteristics Discharge pressure MPa Control mechanism L: Constant horsepower control Pump capacity 28: 28cm 3 /rev, 4: 4cm 3 /rev Mounting method : oot type mounting B: lange type mounting Pump size 2 PZH Series Variable Piston Pump Option type Electro-hydraulic proportional control type (E) P-Q characteristics low rate r /min Discharge pressure MPa Input Current Discharge Rate Characteristics Discharge rate r /min Proportional valve input current m -43
Installation Dimension Drawings PZH-2B- 28 L5**-1 4 Torque Pump capacity 12 Drain port (G3/4) 14.5 (Drain port) 13.2 Key width 6.375.25 11.6h8.54 E D C B 38 4-M12x21 69.9 X 13.2 195 4 to 14.5 9.7 35.8 (Suction, discharge port locations) G SEJ518b 1 1/2 87 144 Discharge port shape 5.8 19 29.8 +.1 Drain port 44 15 +.4 3.5 19 9 141.3 (MX) 138 (MX) uxiliary View X 4-M1x18 23.8 Discharge port SEJ518b 3/4 (6psi) Dimension Table G3/4 Pump Model No. B C D E G PZH-2B- 28 E5**-1 4 L5**-1 67 45 4 22.23 PZH-2B-4L5**-1 83 6 5 25.385.25 25.8.25 27.85.25 175 233.25 184.5 242.5 T port (Rc 1/4) I J 12 (Drain port) Torque 43 (ir bleeder port) Pump capacity X 3 23.8 ir vent Manual flow rate B Key width 6.375.25 C D E.25 11.6h6 configuration 4-M12x21 4-M1x18 35.8 SEJ518b 1 1/2 Drain port 44 29.8 +.1 151 15 3.5 +.4 13.2 14.5 (Drain port) 38 69.9 18 5.8 G H K 9.7 19 128 13.2 195 4 to 14.5 G3/4 Dimension Table 19 9 141.3 (MX) 165 uxiliary View X Pump Model No. B C D E G H I J K Discharge port SEJ518b 3/4 (6psi) E5**-1 67 45 4 22.23 PZH-2B-4E5**-1 83 6 5 25.385.25 25.8.25 27.85.25 175 263 22 3.5 144 16.5.25 184.5 272.5 211.5 31 153.5 7-44
Performance Curves Typical Characteristics at a Hydraulic Operating luid Kinematic Viscosity of 46 mm 2 /s Load Pressure - low Rate Characteristics 6 5 4 3 2 1 *5**-1 Revolution Speed :15min 1 Symbol : ** 11 7 5 22 18 15 6 5 4 3 2 1 *5B**-1 Revolution Speed :18min 1 Symbol : B** B7 B5 B22 B18 B15 B11 Constant Horsepower Input and Symbols Input (kw) PZH-2B-4 4P-5Hz 4P-6Hz 4P-5Hz 4P-6Hz 5.5 5 B5 5 B5 7.5 7 B7 7 B7 11 11 B11 11 B11 15 15 B15 15 B15 18.5 18 B18 18 B18 22 22 B22 22 B22 3 B3 37 B37 {5} {1} {15} {2} {25} {3} {35} {5} {1} {15} {2} {25} {3} {35} PZH-2B-4*5**-1 Revolution Speed :15min 1 Symbol : ** PZH-2B-4*5B**-1 Revolution Speed :18min 1 Symbol : B** 8 8 7 7 B37 6 5 4 3 2 1 5 15 11 7 18 22 6 5 4 3 2 1 B5 B22 B18 B15 B11 B7 B3 {5} {1} {15} {2} {25} {3} {35} {5} {1} {15} {2} {25} {3} {35} Noise Characteristics PZH-2B-4 85 85 Noise level db() 8 75 7 65 18min -1 15min -1 Noise level db() 8 75 7 65 18min -1 15min -1 6 6 55 {5} {1} {15} {2} {25} {3} {35} 55 {5} {1} {15} {2} {25} {3} {35} -45
Cross-sectional Drawing PZH-2B-***-1 List of Sealing Parts Part Part Number Name Q'ty No. PZH-2B-4 1 Oil seal 1 * * 2 O-ring 4 * 3 O-ring 1 * 4 O-ring 1 * 5 O-ring 2 * 6 O-ring 1 * 7 O-ring 1 * 8 O-ring 1 * 9 Backup ring 1 * 1 Backup ring 1 * 11 Backup ring 1 * 12 Packing 6 * 13 Packing 6 * 14 Packing 2 * *These seal products are not available through retail channels. or details, consult your agent. oot Mounting Kit Kit Model No. PZM-2-H-1 pplicable Pump ccessories Dimensions (mm) Weight Model No. Bolt Q'ty Washer Q'ty I J kg 92.5 48 TB-12 35 4 WP-1 4 12. PZH-2B-4 17.5 63-46