Huade Hydraulic was founded in 1979. By introducing technology from Rexroth, Huade Hydraulic has now developed into China's most powerful hydraulic manufacturer. Pressure reducing Valve ZDR 6 D can replace the same series of Rexroth products. It has 3 adjustment elements with sandwich plate design. Compared with other similar products, Huade® pressure reducing valves has more stable performance in this field. Huade Hydraulic focuses on the practicality while maintaining a certain quality level, so that its products win wide market recognition with a lower price.
|
Pressure fluid |
Mineral oil(for NBR seal)or phosphate ester(for FPM seal) |
|
Pressure fluid-temperature range(℃) |
-30 to +80 |
|
Viscosity range(mm ²/s) |
10~800 |
|
Degree of fluid contamination (㎛) |
Maximum permissible degree of |
|
Max.operating Pressure(inlet) (MPa) |
up to 31.5 |
|
Secondary pressure(output) (MPa) |
Up to 2.5,up to 7.5, up to 15.0, up to 21.0 |
|
Back pressure port Y (MPa) |
up to 16.0 |
|
max.flow (L/min) |
up to 50.0 |
|
Weight (kg) |
approx.1.2 |
Features:
▶ Sandwich plate design
▶ 4 pressure ratings
▶ 3 adjustment elements:
. Rotary knob
. Sleeve with hexagon and protective cap
. Lockable rotary knob with scale
▶ Pressure reduction in ports A, B or P
▶ Check valve, optional
▶ Porting pattern to DIN 24 340, form A, ISO 4401 and CETOP - RP 121H
Application:
Pressure Reducing Valve type ZDR 6 D is used to reduce the system pressure.
1. Section and symbol of Pressure Reducing Valve ZDR 6 D
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. The pressure reducing valve basically consists of 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 port A1 is at the same time 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 in port A1 rises still further due to external forces, the control spool (2) is moved still further towards the compression spring (3).
This causes a flow path to be opened at port A1 through control land (9) on the control spool (2) to tank. Sufficient fluid then flows to tank to prevent any further rise in pressure.The spring chamber (7) is always drained to tank externally via drilling (6) to port T (Y).
A pressure gauge connection (8) permits 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 P1.
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 P to A. Otherwise, pressure in port A will be reduced.
structure of ZDR 6 DA1-40B
Symbols of ZDR 6 DP...-40B
Address
No. 27, Yangsha Road, Huilong Town, Qidong City, Jiangsu Province, China
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