We provide our customers with a friendly, experienced point of contact to source Crosby H Series Direct Spring Safety Valves. 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
The Crosby H Series are direct spring safety valves that provide comprehensive overpressure protection for ASME Boiler and Pressure Vessel Code Section I, and Section VIII steam safety applications. H-Series direct spring operated safety valves provide overpressure protection on steam safety applications including economizers, steam drums, superheaters, reheaters and more.
Features
- ASME/NB certified capacities for steam.
- Set and tested on steam.
- Full nozzle flanged option.
- Restricted lift for customized capacity.
- Long service life.
- Low maintenance.
- Two ring set pressure and blowdown control.
- ISOFLEX seat tightness up to 93%. For seat tightness greater than 93% please contact us.
Technical Data
- Sizes: 1¼” F 1½” to 6” RR 10”
- Orifices: 0.307 to 19.29 in2 (1.98 to 124.45 cm2)
- Connections: Flanged or welded inlet
- Temperature range: 1130°F (610°C)
- Set pressures: 15 to 6200 psig (1 to 427 barg)
- Code: ASME Boiler and Pressure Vessel Code Section VIII, Section XIII (UV Designator), Section I (V Designator)
For pricing and delivery on any Crosby H Series Direct Spring Safety Valves please complete the form below or send your RFQ to crosby@chaseint.co.uk.