We provide our customers with a friendly, experienced point of contact to source the Crosby Pressure/Vacuum Relief Valve. We have a broad range of capabilities and bring a wealth of experience and additional value. This means we can supply spare parts or complete products with competitive pricing and delivery. Please complete the form at the bottom of this page or send your RFQ to crosby@chaseint.co.uk.
Crosby pressure relief valves have maintained leadership in overpressure protection for over 140 years. The direct spring-operated safety and pressure relief valves are among the world’s most widely used for oil and gas production and refining, petrochemical and chemical processing, and conventional and nuclear power. Crosby pressure relief valves maintain the industry’s most extensive and capable flow facilities for testing in air, steam, and water.
CHASE has supplied Crosby pressure relief valves for many years. We have a close working relationship with manufacturers, Emerson.

General Application
Crosby Style Pressure/Vacuum Relief Valve is a versatile sanitary relief valve for the brewing, beverage, food processing and pharmaceutical industries.
Features
- Self-actuated operation.
- Relieves excess air or gas pressure.
- Relieves excess liquid pressure in the absence of air or gas blanketing.
- Designed to prevent vacuum formation that could cause the vessel to buckle.
- Body and all internal parts designed to operate after exposure to process fluids and withstand direct flushing and cleansing of sterilizing agents, caustics, water or steam.
- Allows complete drainage after operation and/or flushing and minimizes crevices which might trap contaminants or promote freezing in cold environments.
- Standard FKM O-ring seats on both discs provide tight shutoff.
- All materials are corrosion resistant and all exposed surface finishes are controlled to enhance sanitary features.
- Tamper-proof lead sealed cap.
- Manufactured to ASME Code Section VIII and Section XIII requirements.
- Capacities on compressible fluid certified by the National Board of Boiler and Pressure Vessel Inspectors.
Technical Data
- Sizes: 3″ and 4″ (DN 80 and DN 100)
- Inlet connections: Lug union nut, ANSI flanged, Tri-clamp
- Set pressures: 14.5 to 125 psig (1 to 8.62 barg)
- Vacuum relief (typical): 2″ wc (5 mbarg)
- Temperature range: -15 to +400°F (-26 to +204°C)
- Code: ASME VIII and XIII (UV Designator) (15 psig and above)
For pricing and delivery on any Crosby Pressure/Vacuum Relief Valve please complete the form below or send your RFQ to crosby@chaseint.co.uk.

