New Series Pressure Reducing Valve Sandwich Plate Type ZDR6D-40B
- 1. Sandwich plate design
- 2. 3 adjustment elements: 4 pressure ratings
- 3. Rotary knob, Sleeve with hexagon and protective cap
- 4. Lockable rotary knob with scale
- 5. Pressure reduction in ports A, B or P; Check valve, optional
A high level of excellence in the quality and performance of the product has been maintained by our rigorous quality management system.
Product Description
Pressure reducing valves type ZDR 6 D...are 3-way direct operated pressure reducing valves of sandwich plate design with a pressure relief function on the secondary side. It is used to reduce the system pressure.
The pressure reducing valve basically consists of the housing (1), the control spool (2), a compression spring (3) and the adjustment element (4) as well as with an optional check valve.
The secondary pressure is set by the pressure adjustment element (4).
Model ”ZDR6DA”
At rest, the valve is normally open, and fluid can flow unhindered from port A to port A1. The pressure in part A1 is at the same lime via the control line present at the spool area opposite to the compression spring (3).
When the pressure in port A1 exceeds the pressure level set at the compression spring (3) the control spool (2) moves into the control position against the compression spring (3) and holds the set pressure in port A1 constant.
The control pressure and pilot oil are taken from port A1 via control line.
If the pressure B in port A1 rises still further due to external forces, the control spool (2) is moved still further to wards the compression spring (3).
This causes a flow path to be opened at port A1 through control land ⑼ on the control spool (2) to tank. Sufficient fluid then flows to lank to prevent any further rise in pressure. The spring chamber (7) is always drained lo tank externally via drilling (6) to port T (Y).
A pressure gauge connection (8) per mitts the secondary pressure at the valve to be monitored.
It is only possible to fit a check valve for free flow in ports A1 to A in version "DA".
Models "DP"' and "DB"'
In model "DP"', the pressure is reduced in port P1. The control pressure and the pilot oil is taken internally from port PI.
In model DB, the pressure in port P1 is reduced, and the pilot oil taken from port B.
Attention?
In model DB. it must be ensured, that the pressure in port B is not higher than the set pressure when the directional valve is in position Pto A. Otherwise, pressure in port A will be reduced.
Characteristic curves(measured at V=41mm2/s and t=50℃)
Unit dimensions(Dimensions in mm)
Its quality is guaranteed through the implementation of our rigorous control process for production.
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