Features of Pilot operated pressure relief valve with one or two pressure relief cartridges:
-Sandwich plate valve
- 4 pressure ranges
- 5 circuit options
- 4 adjustment elements:
. Rotary knob
. Sleeve with hexagon and protective cap
. Lockable rotary knob with scale
. Lockable rotary knob
Functional description of
Pilot operated pressure relief valve with one or two pressure relief cartridges:
Pressure relief valve types ZDB and 22DB are pilot operated and are of sandwich plate design. They are used to limit the pressure within a hydraulic system. They basically consist of the housing (7), together with one or two pressure relief valve cartridges.
The system pressure is set by means of adjustment element (4).
At rest, the valve is closed. Pressure in port A acts on the spool (1). At the same time pressure passes through orifice (2) on to the spring loaded side of spool (1) and via orifice (3) to the pilot poppet (6). If the pressure in port A rises above the value set on spring (5), the pilot poppet (6) opens. Fluid can now flow from the spring loaded side of spool (1), orifice (3), and channel (8) into port T. The resulting pressure drop then moves spool (1), causing this to open
connection A to T, while the pressure set at spring (5) is maintained.
Pilot oil from the two spring chambers returns externally to tank via port T.
Section of
sandwich plate Pilot operated pressure relief valve:
Technical data of
sandwich plate Pilot operated pressure relief valve:
Pressure Fluid | Mineral oil or Phospate ester |
Temperature range ℃ | -30~+80 |
Viscosity range mm²/s | 10~800 |
Oil contamination level | Recommend a filter with a minimum retention rate of β10≥75 |
Max. operating pressure (Mpa) | To 31.5 |
Max. setting pressure (Mpa) | to 5\to 10\to 20\to 31.5 |
Max. flow L/min | To 60 |
Weight (kg) | ZDB 6 | Approx 1 |
Z2DB 6 | Approx 1.2 |
Ordering details of
sandwich plate Pilot operated pressure relief valve:
Symbol: 1=valve side, 2=plate side
Unit dimensions (dimensions in mm)
Type ZDB6 VA...
Type ZDB6 VB... and Type ZDB6 VP...
Type Z2DB6 VC... and Type Z2DB6 VD...