1. Product Description
Pressure shut-off valve, pilot operated types DA/DAW...L5X
Pressure control valves type DA/DAW are pilot operated pressure shut-off valves.
They are used to charge fluid to accumulator in system, or to unload the low pressure pump in high/low pressure pump system.
Pressure shut-off valves basically consist of the main valve (1) with the spool assembly (3), pilot valve (2) with pressure adjustment element and check valve (4). In valves size 10, the check valve (4.1) is built into the main valve (1). In valve sizes 25 and 32, the check valve (4.2) is built into a separate plate installed under the main valve (1).
Pressure shut-off valve type DA
Diverting pump flow from P to A to P to T.
The pump delivers flow via check valve (4) into the hydraulic system (P to A). Pressure in port A acts on the pilot control spool (6) via pilot line (5). At the same time, pressure in port P passes to the spring loaded side of the main spool (3) and ball (9) in the pilot valve (2) via orifices (7) and (8). As soon as the setting pressure in the hydraulic system is reached, the ball (9) lifts off against spring (10). Pressure fluid now flows via orifices (7) and (8) into spring chamber (11). The fluid returns to tank either internally via control line (12) in valve type DA .. L5X/ ... or externally via control line (13) in valve type DA .. L5X/ .. Y ... Due to orifices (7) and (8), pressure drop is now presented at the main spool (3). The main spool (3) now lifts off its seat and opens the connection from P to T. The check valve (4) closes the connection from A to P. The ball valve (9) is kept opening by the system pressure via pilot spool (6).
Diverting pump flow from P to T to P to A.
The area of the pilot spool (6) is 10 % or optionally 17 % greater than the effective area of the ball (9). The effective force on the pilot spool (6) is, therefore, 10 or 17 % greater than the effective force on the ball (9).
When the actuator pressure falls to the cut-off pressure which corresponds to the switching pressure differential, spring (10) pushes ball (9) on to its seat. Pressure is then built up on the spring loaded side of the main spool (3). In conjunction with spring (14), the main spool (3) is closed the connection from P to T is isolated. The pump flow passes again via the check valve (4) into the hydraulic system (P to A).
Pressure shut-off valve type DAW
The function of this valve is basically the same as the DA valve. A solenoid directional valve (15) can, however switch the setting cut-off pressure of the pilot valve either from P to A or from P to T.
2.Product Photos
3. Company Profile
NNINGBO POWER HYDRAULIC MOTOR CO.,LTD is a wel-trusted manufacturer in hydraulic industy.
The company have achieved IS09001:2015 quality system, relying on strong technology development and production capacity,our annual output 600 thousand pieces. We produce all kinds of hydraulic valve, mainly include Rexroth and Yuken series of hydraulic valve products. Our products are widely used in mining, engineering, construction, plastics, chemicals, machine tools and so on. Our goal is to continue to deliver cost-effective products and more improved electro-hydraulic technology solutions.
We also aim to help our customer to attain competitive advantage. It is our business to create more solutions, not just to satisfy the needs of our customers but also to help them progress in the industry.
4. Certificates
5. Factory
6. FAQ
Q1: Are you trading company or manufacturer ?
A: We are factory.
Q2: How long is your delivery time?
A: Generally it is 3-5 days if the goods are in stock, or it is 20-30 days if the goods are not in stock, it is according to quantity.
Q3: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q4: What is your terms of payment ?
A: Payment<=5000USD, 100% in advance. Payment>=5000USD, 30% T/T in advance ,balance before shippment. If you have another question, pls feel free to contact us.
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