Function and configurationThe type ZDBD pressure relief valves are direct operated poppet valve, and they are sandwich structure, used to limit the pressure in a hydraulic system.The pressure relief v...
Product Detail
Function and configuration
The type ZDBD pressure relief valves are direct operated poppet valve, and they are sandwich structure, used to limit the pressure in a hydraulic system.
The pressure relief valves consist mainly of the housing (1), together with one or two pressure relief valve cartridges. And the pressure relief valve cartridges mainly include the sleeve (2), spring (3), poppet (4), adjustment elements (5) and valve seat (6).
If the pressure in lines rises excess the value setting at the spring (3), the poppet spool(4) opens. While lower the value, the poppet spool(4) are pushed onto the valve seat(6) by the spring(3). When the difference between the setting value and the actual pressure in the lines get one quite value, the poppet(4) and the valve seat(6) can realize seal up without any leakage, then it can work together with hydraulic lock to make the cylinder conquers its descent because of gravity and maintain on its "stop" position.
They are especially suitable to be used as sandwich plate safety valves for actuators which are strictly in demand for internal leakage.
Notes: The ZDBD pressure relief valves are direct operated, have less internalleakage, but higher starting pressure and little flow, If lower starting pressure is notdemanded, they can be used as safety valves.
Symbols
Ordering code
11
Technical data
| Fluid | Mineral oil suitable for NBR and FKM seal | |||||||||||||||||||
| Phosphate ester for FKM seal | ||||||||||||||||||||
| Fluid temperature range ℃ | -30 to +80 (NBR seal) | |||||||||||||||||||
| -20 to +80 (FKM seal) | ||||||||||||||||||||
| Viscosity range m㎡/s | 10 to 800 | |||||||||||||||||||
| Degree of contamination | Maximum permissible degree of fluid contamination: Class 9. NAS 1638 or 20/18/15, ISO4406 | |||||||||||||||||||
| Max.operating pressure bar | To 315 | |||||||||||||||||||
| Max.adjustable pressure bar | 50;100;200;315 | |||||||||||||||||||
| Size | 6 | 10 | 16 | 22 | 32 | |||||||||||||||
| Max.flow-rate L/min | 30 | 80 | 160 | 250 | 250 | |||||||||||||||
| Relief function Weight kg | A | B | C | D | A | B | C | D | A | B | C | D | A | B | C | D | A | B | C | D |
| 2 | 3 | 4 | 4 | 6 | 9 | 13 | 16 | 12 | 25 | 32 | 29 | 47 | 55 | 57 | 53 | |||||
Unit dimensions (A, B and C)
Unit dimensions (A, B and C)
Unit dimensions (A, B and C)
Unit dimensions (A, B and C)
Unit dimensions (A,B and C)
Unit dimensions (D)
Unit dimensions (D)
