Function and configurationPressure reducing valves type ZDR6D.. are 3-way direct operated, sandwich plate design with a pressure reducing function on the secondary side. It is used to reduce the syste...
Product Detail
Function and configuration
Pressure reducing valves type ZDR6D.. are 3-way direct operated, sandwich plate design with a pressure reducing 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), two compression springs (3) and the adjustment element (4) as well as with an optional check valve.
Model DA:
At static state, the valve is normally open, and fluid can flow freely from port P2 to port P1 (version "DP") or from port A1 to port A2 (version "DA"). Pressure in port P1 acts at the spool area via control line (5) and is balanced with the setting value of the compression spring (3).
When the pressure in port P1 exceeds the setting value of the spring (3), the control spool (2) moves further towards the compression spring (3), the opening aperture at port P is getting smaller until fluid at port P1 flows back to the tank through the orifice (6) of the control spool (2) to prevent any further rise in pressure. The leakage oil in spring chamber (7) is always drained to tank through port T (Y).
A check valve can be fitted optionally in version "DA" for free flow from ports A2 to ports A1.
A pressure gauge connection (8) permits the secondary pressure to be monitored.
In model DA, one-way valve can only be mounted with the oil port from A2 to A1 to make the flow passage smooth.
Model DP and DB:
In model DP, oil port P1 is pressure reduced; signal and control oil is provided from the inside of oil port P1.
In model DB, oil port P1 is pressure reduced; but control oil is from oil port B.
Type: ZDR6DA1-L4X/...YM...
Note:
1. In model DB, when directional valve is in position from P to A, please make sure the pressure of oil portB is no more than the set value, otherwise, the pressure of oil port A is reduced.
2. For internal leakage, superposition relief value for in pair with superposition (hydraulic controlled)one-way valve shall be installed between the superposition (hydraulic control) one-way valve and thedirectional change valve.
Symbols
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 secondary pressure (inlet) bar | 315 |
| Max secondary pressure (outlet) bar | 25;75;150;210 |
| Backpressure oil port T (Y) bar | 160 |
| Max flow L/min | 50 |
| Weight kg | About1.2 |
Characteristic curves (Measured at oil =40°c +5°c,using HLP46)
This work curve is effective to the relief function in case of outlet pressure =0 within the overall range.
Unit dimensions
