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Ningbo Power Hydraulic Motor Co., Ltd.
Ningbo Power Hydraulic Motor Co., Ltd.  

Gold Index: 20032

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Pressure control valves with subplate mounting 

Price: 10.0~100.0 USD 
Place of Origin: Zhejiang, China (Mainland) 
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Product Detail

Model No.: DA/DAW...30B
Packing: carton
Power: Solenoid
Pressure: High Pressure
Material: Casting
Media: Oil
Production Capacity: 20000pc/month
Delivery Date: 2 weeks
Standard or Nonstandard: Standard
Structure: Pilot
Temperature of Media: Others
Brand Name: Power

Features:
- For subplate mounting:
- 4 adjustment elements:
. Rotary knob
. Sleeve with internal hexagon and protective cap

Features:
- For subplate mounting:
- 4 adjustment elements:
. Rotary knob
. Sleeve with internal hexagon and protective cap
. Lockable rotary knob with scale
. Rotary knob with scale
- 3 pressure ratings
- Solenoid actuated unloading via a built-in directional valve


Functional description
Pressure control valves type DA/DAW are pilot operated pressure shut-off valves.
They are used to switch a pump flow over to unpressurised by-pass as soon as the accumulator loading pressure is reached. Further applications for the valve are in systems that have high and low pressure pumps. In this case the low pressure pump is switched to unpressurised by-pass as soon as the set high pressure is reached.
Pressure shut-off valves basically consist of the main valve with the main spool assembly, pilot valve with pressure adjustment element and check valve. In size 10 valves, the check valve is built into the main valve. In valve sizes 25 and 32 the check valve is built into a separate plate installed under the main Pressure shut-off valve type DA.
Diverting pump flow from P to A to P to T.
The pump delivers flow via check valve (1) into the hydraulic system (P to A). Pressure in port A acts via pilot line (3) on the pilot control spool (4). At the same time, pressure in port P passes via orifices (5) and (7) to the spring loaded side of the main spool (6) and poppet (8) in the pilot valve (2). As soon as the set cut-off pressure in the hydraulic system is reached, the poppet(8) lifts off against spring (9). Pressure fluid now flows via orifices (5) and (7) into spring chamber (11). From here, the fluid is returned to tank either internally via control line in valve type DA..30B/... or externally via control line in valve type DA..30B/..Y...
Due to orifices (5) and (7), a pressure drop is now present at the main spool (6). The main spool (6) now lifts off its seat and opens the connection from P to T. The check valve (1) now closes the connection from A to P. The poppet (8) is now held open by the system pressure via pilot spool (4).
Diverting pump flow from P to T to P to A.
The area of the pilot spool (4) is 17% greater than the effective area of the poppet (8). The effective force on the pilot spool (4) is, therefore, 17% greater than the effective force on the poppet (8). When the actuator pressure falls in relation to the cut-off pressure by a value which corresponds to the switching pressure differential, spring (9) pushes poppet (8) on to its seat. Pressure is then built up on the spring loaded side of the main spool (6). In conjunction with spring (10), this closes the main spool (6) and isolates the connection from P to T. The pump flow passes once more via the check valve (1) into the hydraulic system (P to A).
Pressure cut-off valve type DAW
The function of this valve is basically the same as the DA valve. A solenoid actuated directional valve (12) can, however switch the set cut-off pressure which is under the pilot valve (2) either from P to T or from P to A.

Section of DA10...30B/ Pressure shut-off valve pilot operated

Section of DAW20,30...30B/ Pressure shut-off valve pilot operated

Symbol:
Pressure shut-off valve pilot operated


Circuit examples:

Hydraulic system with accumulator
Pressure shut-off valve pilot operated

Application guidelines:
The connection between the DA valve and the hydraulic accumulator should be as possible and with a low pressure drop. With high pump flows as well as small switch differentials (10%) then preferable the "Y" version should be used.


Hydraulic system with high and low pressure pumps
Pressure shut-off valve pilot operated


Ordering codes:
Pressure shut-off valve pilot operated


Technical data:
Size
10
20
13.4
Max. flow        L/min
40
100
250
switching pressure range from P→T,P→A
Generally within the range of 17%
Operating pressure port A (Mpa)
To 31.5
Max. settable pressure   (Mpa)
To 8, to 16, to 31.5
Pressure Fluid
Mineral oil or Phospate ester
Viscosity range       mm²/s
10~800
Temperature range      ℃
-30~+80
Filtration
Max. permissible Degree of fluid contamination is to NAS 1638, class 9β10≥75
Weight     (kg)
DA
3.8
7.7
13.4
DAW
4.9
8.8
14.5
Directional valve characteristic
See WE5


Unit dimensions (dimensions in mm)

Size 10
Pressure shut-off valve pilot operated


Size 20, 30
Pressure shut-off valve pilot operated
Mr. shawn
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Tel: 86-574-87193975
Fax: 86-574-23671688
Mobile: 86- 181 5744 9077
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Company Info

Ningbo Power Hydraulic Motor Co., Ltd. [China (Mainland)]


Business Type:Manufacturer, Trading Company, Agent, Distributor/Wholesaler, Service
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)

shawn:   skype

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