Safety Relief Valve RL50-M

The RL50M is a 1/2” manifold mounted relief valve. Designed for emergency relief applications, it may be used to protect systems up to 1,034 bar (15,000 psi). The valve is a proportional metering style relief valve, and is approved as a safety accessory to category IV of the Pressure Equipment Directive, enabling its use in the most demanding applications.

Approved to category IV of the Pressure Equipment Directive (2014/68/EU)

Available preset or may be set via internal adjustment

Convenient manifold mounted style allows removal for servicing without disturbing pipework

Minimal leakage at 90% of set pressure

Reseat within 20% of set pressure

Repeatably within ±5% of set pressure

Subsea variants available, contact us for advice

Suitable for use with mineral oils and water glycols, with options for water and sea water duty

Suitable for many other media, contact us for advice

Various spring ranges available.





Max Working Pressure

1,034 bar



Fluid: Liquid



Port Size – 1/2’’



2.9 KG (6.4 lb)



Externally Exposed Parts:

316 stainless steel on all pressure retaining components, 300 series stainless steel is used for the external adjuster. The non-wetted and enclosed internal adjuster is chrome steel and brass.


Internally Wetted Parts:

316, 302 and 431 stainless steel. The seat and ball are 440C stainless steel and silicon nitride respectively.