Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of pilot reducing valve in China, also supports customized service. If you're going to wholesale high quality pilot reducing valve made in China, welcome to get pricelist from our factory.
DR Pilot Reducing Valve - 31.5 MPa, 150 L/min
Some parts of a hydraulic system need less pressure than the pump delivers. You could put an orifice in the line. That would drop the pressure, but it wouldn't stay stable - as flow changes, pressure changes.
The DR is a pilot reducing valve. It drops pressure to a set value and holds it there, regardless of what's happening upstream. If the main system pressure fluctuates, the DR compensates. The downstream circuit gets a steady, predictable pressure.
This matters for clamping. If the clamping pressure varies, parts shift or get damaged. It matters for pilot controls. If the pilot pressure varies, the main valve shifts at different speeds. The DR keeps these circuits stable.
What is a reducing valve, exactly?
A reducing valve does one thing: it takes high pressure in, puts lower pressure out, and keeps it there - even when the inlet pressure moves around.
People mix them up with relief valves. They're not the same.
A relief valve opens to tank when pressure gets too high. It limits pressure.
A reducing valve holds a circuit at a lower pressure than the main system. It sets pressure.
The DR is pilot-operated. A small pilot stage controls the main spool. Smoother, more stable than direct-acting valves.
Specification
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PRODUCT PARAMETERS |
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Specification |
10 |
20 |
30 |
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Max working pressure (Mpa) |
31.5 |
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Max.Flow (L/min) |
150 |
300 |
400 |
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Pressure adjustment (Mpa) |
5 / 10 / 20 / 30 |
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Design Number |
50 |
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Where it belongs
The DR goes where a circuit needs steady, lower pressure. A few examples:
Machine tools - clamping, feed controls. The clamp needs consistent pressure. Too much and you crush the part. Too little and it moves.
Clamping systems - workholding. Pressure that drifts means force that drifts. Parts don't stay put.
Presses - pilot control circuits. The main valve won't be accurate if the pilot pressure isn't stable.
Automated equipment - any circuit with parts that can't take full system pressure.
Drain and control options
The DR can be configured in different ways. These choices affect how the pilot reducing valve behaves in your circuit.
Internal drain (standard)
The pilot oil returns through the valve outlet. This is the simplest setup - no extra line to tank. Use it when the outlet pressure is low.
External drain
The pilot oil goes straight to tank through a separate port. Use this when the outlet circuit has high backpressure. Otherwise the backpressure fights the pilot spring and the pressure setting changes.
Internal control (standard)
The valve senses pressure at its own outlet. Simple, reliable - one less connection.
External control
The valve is controlled by an external pilot pressure signal. Use this when you need the reduced pressure to be controlled from somewhere else.
Not sure which combination you need? Send a circuit diagram. We'll tell you what fits.
How it works
Here's how it works. The valve watches its outlet pressure. Below the set point, the main spool opens wider-more oil flows through. Above it, the spool closes down a bit, restricting flow.
It does this on its own, continuously. Set it once, leave it alone.
The pilot stage is the key. A small pilot valve senses outlet pressure and adjusts the control pressure on top of the main spool. The main spool follows that signal. Two-stage design, better stability than direct-acting valves.
About Our Company
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Onederful® Hydraulic Technology Co., Ltd., has been making hydraulic components since 1988. Directional valves, pressure valves, flow valves - and accessories.
Products go to Russia, Europe, the Middle East, South America, and Asia. ISO 9001 certified. Each valve is tested individually, with data linked to its serial number.
Packaging and transportation
Factory workshop
FAQ
Q: What kind of valve is the DR series?
A: The DR series is a pilot-operated pressure reducing valve, used to reduce the pressure in a specific branch of a hydraulic system, so that the secondary circuit can obtain a stable oil pressure lower than that of the main system.
Q: What is the reason the outlet pressure of the DR valve fails to rise?
A: DR valve outlet pressure won't rise? Two main causes: external leakage (worn seals) or poor cone-to-seat contact.
Q: The pressure of the DR valve fluctuates unstably. How should it be dealt with?
A: Common causes: air in oil, blocked damping holes, stuck spool, weak or deformed spring. Troubleshoot in order: bleed air, clean damping holes, check spool movement and spring condition. Replace as needed.
Q: What could be the reason if the DR valve doesn't respond when adjusting the pressure?
A: No pressure drop when adjusting the handwheel? Main spool is likely stuck. Can't reach minimum set pressure? The pilot valve O-ring may be too tight against the valve cover.
Q: What should be noted during the initial debugging of the DR valve?
A: Before first use, check oil circuit connections. Loosen the adjusting handwheel fully before starting the pump. After pressurizing, turn clockwise slowly while monitoring the pressure gauge-increase gradually to the set value. Debug with flow running; no-flow adjustment leads to inaccurate settings.
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