Pressure Relief Valves

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Pressure Relief Valves


Pressure Relief Valves

Parker’s pressure relief valves are designed to limit the upstream pressure by opening at a preset value and discharging the medium. Our range includes pressure relief valves in different mounting styles and for a variety of application areas: industrial as well as mobile, for the use in hydraulic and pneumatic systems, for fluid and gas handling, process control and refrigeration. Our valves can function under high operating pressures and wide-ranging temperatures which make them suitable for use within various applications across the major industrial markets, including those that operate in extreme environments.


Parker’s pilot operated relief valves are designed for continuous duty applications featuring great stability with low pressure drop; working with pressures up to 420 bar (6000 psi) and flows up to 400 lpm (106 gpm).

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The H Series of Safety Relief Valves are designed to protect refrigeration systems from overpressure situations and feature a high flow capacity. The H Series are flanged for easy replacement and can be used in a single or dual relief combination.

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Parker’s direct acting relief valves are available in several cavity sizes and are designed for continuous duty applications with pressures up to 420 bar (6000 psi) and flows up to 200 lpm (53 gpm).

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Parker Autoclave's RVP Series relief valves provide reliable venting of gases for set pressures from 3,000 psi (206 bar) to 75,000 psi (5171 bar). The valve’s metal seat design provides shut-off of liquids and gases to commercial standards.

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Parker pilot operated pressure relief valves for subplate mounting series R4V/R6V provide an outstanding constant pressure behaviour. Series R4V/R6V Proportional enables a continuous pressure adjustment by the additional proportional unit.

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Parker Autoclave's RVS Series relief valves provide reliable venting of gases for set pressures from 1,500 psi (103 bar) to 20,000 psi (1378 bar). The valve’s soft seat design provides bubble tight sealing, repeatable pop-off, and reseat capability.

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Parker digital amplifier modules series PCD00A-400 combine all necessary functions for the optimal operation of two proportional pressure/flow control valves.

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The RV Series is a PTFE relief valve that’s ideally suited for ultra-high purity semiconductor, DI water, and aggressive chemical applications. The valve is highly compact and can be adjusted in the field to provide safe and reliable pressure relief.

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Parker Bestobell’s cryogenic safety relief valves are designed to reduce the risk of damage from over-pressure to static and road-going cryogenic storage tanks. They work by an innovative proportional lift action to ensure gentle release of pressure.

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Parker’s direct acting differential area relief valves are for fast response intermittent applications and work up to 380 bar (5500 psi) and 151 lpm (40 gpm). These valves have lower leakage rates and pressure rise than standard direct acting reliefs.

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The Parker VR7 Series Pressure Relief Valve is designed to ensure safety and protection of downstream process equipment by venting excess pressure from a regulator should a minor seat leak occur. It is available in stainless steel.

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Parker's direct operated proportional pressure relief valve series RE06M*W provides a fast response time and low presssure drop due to its powerful solenoid.

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Parker pilot operated pressure relief valves series R5V and R5V*P2 provide an outstanding constant pressure behaviour. The SAE flanges allow to mount the valves directly on the flanges of pumps or actuators to achieve a very compact design.

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Parker's pilot operated pressure relief valves series ZDV in sandwich design offer maximum flow rates up to 140l/min and enable an easy configuration of stack systems.

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Parker electronic modules series PWDXXA-40* combine all necessary functions for the optimal operation of proportional directional control valves with position sensor or valves in closed loop systems.

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The proportional pressure relief valve series RE06M*T (NG06) with onboard electronics provides a fast response time and low presssure drop. It is based on the functionality of the digital amplifier PCD00.

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REGIONAL - Parker’s pilot operated ventable relief valves offer the ability to control the pressure setting via internal adjustment or remote circuit; ideal in applications that require multiple settings up to 420 bar (6000 psi) and 400 lpm (106 gpm).

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Pressure relief valves series RDM are direct operated piston type valves with low hysteresis. They can be used as P-T relief or as T-T controlled counter balance valve.

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REGIONAL - Parker’s family of 2-way proportional poppet valves are available in normally-open or normally-closed configurations and are capable of flows up to 117 lpm (31 gpm) and pressures as high as 210 bar (3000 psi).

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Parker pilot operated pressure relief valves for in-line mounting series R4V provide an outstanding constant pressure behaviour. Series R4V*P2 enables a continuous pressure adjustment by the additional proportional unit.

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Pilot operated pressure relief valves series R4V (TUEV) and R6V (TUEV) provide an outstanding constant pressure behaviour. They include a certification according to directive 97/23/EG for the usage in safety-related applications.

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REGIONAL - Parker’s pilot operated relief valves with reverse flow check are designed for continuous duty applications for working with pressures up to 420 bar (6000 psi) and flows up to 350 lpm (92 gpm).

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The proven counterbalance valve series ZNS in size NG06 (CETOP 03) and NG10 (CETOP 05) enables a reliable operation by controlling the actuator movement at overrunning loads.

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Parker Bestobell’s cryogenic thermal relief valve is designed to prevent damage to piping and equipment caused by the expansion of liquefied gases. It prevents liquefied gases being trapped between two closed valves.

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The pilot operated pressure relief valves series R and RS*E are particularly suitable for the protection of the pump. These valves in slip-in cartridge design are offered as complete units and available in numerous variations.

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