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NEW PED-certified Hydraulic Cartridge Valve for High Pressure Accumulator Circuits on Off-Highway Suspensions

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RVD50-20P Valve

HydraForce has released a new, high pressure, direct-acting, poppet-type, hydraulic safety relief valve that is suitable for use as a safety accessory in Category IV Group 2 applications as rated by the European Commission (EC) Pressure Equipment Directive (PED) 97/23/EC. It has an operating pressure of 385 bar (5575 psi) and flow rate up to 113 lpm (30 gpm). The new RVD50-20P cartridge valve is ideal for use as a pressure limiting device for hydraulic circuit protection. It blocks flow from port 1 to port 2 until sufficient pressure is present at port 1 to force the poppet from its seat.

The hydraulic schematic (below) depicts how the PED-certified RVD50-20P valve is used in a circuit to protect the accumulators. Hydraulic flow from the pump is controlled by the load-sensing EC16-42 pressure compensator valve, which provides priority flow to the steering unit while allowing excess flow to be used for auxiliary finctions.

PED Circuit

The UP10-40 unloading pilot valve near the compensator allows flow for dynamic steering. If steering "bottoms out", the RVD50-20 valve opens to relieve excess flow to tank.

The HLS06-30 valve communicates the load signal of the accumulator charge function to the LS pump in order to provide adequate charge flow to the accumulator.

The LS10-41 shuttle valve is used in the case of accumulator failure; should one of the accumulators fail, the LS10-41 will shift over to protect the operational accumulator. When pressure at one of the two load ports exceeds the other, the poppets shuttle to give priority flow and pressure to the port with the highest load.

The PED-certified RVD50-20P protects the accumulator circuit by providing dynamic response to pressure spikes and relieving excess pressure to tank. The valve has fast response to pressure spikes and low leakage, which helps reduce the number of accumulator charging cycles throughout the life of the machine.

Features Benefits
Meets PED certification for European Commission (EC) Pressure Equipment Directive (PED 97/23/EC) suitable for use as a safety accessory in PED Category IV Group 2 applications. Can be specified in the European market for applications which require the highest safety level of the European Pressure Equipment Directive (PED).
Six spring ranges available - 08, 15, 54, 32, 42 and 50 - ranging from 13.7 bar/200 psi up to
350 bar/5075 psi.
Versatility and flexibility in application with flows and pressures to suit the need.
Tamper-proof, sealed housing. Safe and secure. No maintenance required. Corrosion-resistant. Weatherproof.
Standard VC10-2 cavity. Standard, stocked housings can be used. No new tooling.
Operating pressure to 385 bar/5575 psi. Can be specified for high-pressure applications.
Superior plating capable of withstanding 960 hours minimum salt spray to red rust per ASTM B117. Long life; no worries about wear or decreased performance over time.
Internal leakage rate of 0.25 cc/minute
(5 drops/minute) max to 80% of nominal setting.
Low internal leakage.
Designed, inspected and tested to HydraForce quality standards with 5-year warrenty. (See full warranty statement in the catalog.) Performance guaranteed for five years.

See RVD50-20P catalog page

Disclaimer: Nothing in this document constitutes an implied warranty of merchantability or of fitness for a particular purpose. The information contained in this document is provided for technical illustration purposes only and may not be used as a statement of suitability for use in any particular application. Each application is unique and prospective purchasers should conduct their own tests and studies to determine the fitness of HydraForce's products for their particular purposes and specific applications.


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