Shijiazhuang Laiye Imort& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of dr pilot operated pressure reducing valve in China, also supports customized service. If you're going to wholesale high quality dr pilot operated pressure reducing valve made in China, welcome to get pricelist from our factory.
Product Overview
The DR pilot operated pressure reducing valve maintains a constant reduced pressure in a secondary circuit, even when the primary circuit pressure fluctuates or the load varies. Designed as a sandwich‑plate or cartridge type for NG6 (CETOP 3) systems, this valve ensures downstream actuators receive only the pressure they need – no more, no less. At Onederful® Hydraulic, we machine each DR valve body from high‑density cast iron, assemble it with hardened internal parts, and test every unit under real‑world pressure spikes before shipping.
Key Technical Parameters
| Parameter | Value |
|---|---|
| Nominal size | NG6 / NG10 (ISO 4401‑03/05) |
| Max. primary pressure (inlet) | 315 bar |
| Secondary pressure range | 5 – 210 bar (adjustable) |
| Max. flow rate | 60 L/min (NG6) / 120 L/min (NG10) |
| Adjustment type | Rotary knob with scale, optional lockable screw |
| Hysteresis | < 3% of set pressure |
| Response time | < 30 ms (typical) |
| Fluid temperature range | -20°C to +80°C (NBR seals) / up to +120°C (FKM) |
Material & Construction
Valve body – nodular cast iron (GGG 40), phosphate‑coated for corrosion resistance
Main spool & pilot spool – case‑hardened 20MnCr5 steel, precision ground to 0.002 mm roundness
Spring chamber – sealed with O‑rings, vented to tank port (dry chamber design)
Adjustment screw – stainless steel with fine pitch, anti‑vibration locking nut
Seals – standard NBR (mineral oil) or FKM (HFD / phosphate ester fluids)
Each material batch is traceable to ISO 9001:2015 certified suppliers.
Why Choose Onederful®
Company Strength & Development History
Founded in 1988, Shijiazhuang Laiye Import & Export Trading Co., Ltd (part of Hebei Wendefu Hydraulic Technology Co., Ltd.) has 35+ years of pressure valve manufacturing experience. Our team of 200+ professionals ships over 10,000 containers annually to customers in Russia, Europe, the Middle East, South America, and Asia.
Typical Applications
Wherever you need a fixed lower pressure that does not vary with main circuit load, the DR pilot operated pressure reducing valve delivers reliable performance.
Clamping circuits
reduces pump pressure to a safe level for hydraulic clamps without overheating the oil
Lubrication systems
provides stable low pressure (e.g., 20 bar) from a high‑pressure main circuit
Sequential control
feeds a lower‑pressure subcircuit (e.g., pilot control) while the main circuit runs at 250 bar
Test benches
generates multiple regulated pressure levels from one pump
Injection molding machines
maintains consistent back pressure during screw retraction
Services We Provide for Every DR Order
OEM customization – supply your drawing; we modify port threads, seal material, or adjustment type
Free technical support – our engineers help select the correct spring range for your flow and pressure
Fast logistics – stock orders ship in 2‑3 business days; custom orders 10‑14 days
12‑month warranty against B/L date – covers manufacturing defects only, but we have a <0.3% return rate
Packing – antirust oil + plastic bag + foam‑lined carton for small units; plywood case for bulk
Phone Number
+86 19103298301
nadia.laiye0909@gmail.com
Certifications
Create a comprehensive solution for efficient human theft manag
Frequently Asked Questions (FAQ)
Can the DR pilot operated pressure reducing valve work in reverse flow direction?
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Yes. The valve includes an integrated check valve that allows free flow from secondary port A back to primary port P. This prevents pressure trapping when the actuator retracts.
How do I adjust the secondary pressure without a pressure gauge?
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Temporarily install a test gauge at port A. Loosen the lock nut, turn the knob clockwise to increase pressure, counter‑clockwise to decrease. Set to desired value, then retighten the lock nut. For production runs, we can pre‑calibrate each valve to your specified pressure at the factory.
What happens if the tank line (T) is blocked or undersized?
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The pilot flow cannot drain, causing the valve to lose regulation – secondary pressure will rise close to primary pressure. Always ensure tank port T has a direct, unrestricted line to the reservoir (back pressure < 2 bar).
Is the DR suitable for water‑glycol fluids (HFC)?
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Yes, but you must select the FKM seal option and specify "HFC service". The internal steel parts are compatible, but we apply a special anti‑rust coating.
What is the typical leakage of a new DR valve?
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Internal leakage from secondary to tank (pilot stage) is ≤ 0.3 L/min at full pressure. Main spool leakage from primary to secondary is less than 0.05 L/min – virtually negligible for most circuits.
Contact us now!
From a single prototype to a pallet of 100 pieces, Onederful® delivers consistent, factory‑tested hydraulic control. Request your quote now – we'll respond within 4 business hours.
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