Cashco rupture-disc valve assemblies combine a rupture disc (primary overpressure protection) with a Cashco pressure regulator or back-pressure/relief valve. This engineered pairing provides instantaneous pressure relief via the disc, and controlled venting or pressure regulation via the valve. Such assemblies are vital in oil and gas, chemical, petrochemical, and process plants where precision, protection, and compliance matter.

Product Categories

• Back-Pressure/Relief Regulators (e.g. Models BA1/BL1, 123, CA-1/CA-2, 8311)
• Pressure Reducing Regulators (e.g. Models D/DL, 3381/4381, 1000LP/1000HP)

These regulators are typically paired with rupture discs upstream or downstream, depending on service needs.

Features

• Operating Pressure: inlet/outlet pressures range from low (<1 psig) up to 300 psig (20.7 bar) depending on model
• Materials: stainless steel, bronze, carbon steel; diaphragm protection recommended
• Connections: sizes DN6–DN100, with ends including NPT, flanged, Tri-Clamp®
• Tightness: diaphragm-sealed designs, with leakage to seat classes IV–VI
• Standards: Not safety devices; require rupture disc or relief valve for ASME/API compliance
• Maintenance: replaceable diaphragms/springs; block and bypass valves recommended

Category Key Features

Back-Pressure/Relief Regulators

Intro: Designed to maintain a set upstream pressure, these regulators protect upstream systems from overpressure when combined with a rupture disc.

• Operating Pressure: inlet up to 1.2× range spring (e.g. 50 psig spring → 60 psig max)
• Temperature: typical ranges from –20 °F to +450 °F depending on materials
• Flow & Cv: sized DN6–DN100; consult model-specific bulletins
• End Connections: Tri-Clamp®, NPT, flanges
• Leakage: diaphragm-sealed, tight (<class IV)
• Standards: require rupture disc; not certified as safety devices
• Maintenance: field-serviceable; replace internal parts via IOM manuals

Pressure Reducing Regulators

Intro: These control downstream pressure and require downstream overpressure protection when used with rupture discs.

• Operating Pressure: upstream up to 740 psig (51.0 bar) for high-pressure models; downstream up to 300 psig (20.7 bar)
• Temperature: –20 °F to +400 °F standard; up to +600 °F optional with graphite gasket
• Flow & Cv: Cv values available in bulletins; full port Cv for sizing safety relief
• Line Size & Connections: DN15–DN50, NPT or flanged (150# / 300#)
• Leakage Class: metal seats to class IV; composition seats to class VI
• Standards: require rupture disc as upstream or downstream protection
• Maintenance: replaceable trim, diaphragms; mechanical travel stops for diaphragm protection

Applications

• Oil & Gas: wellhead, storage, separator vessels
• Petrochemical: reactor systems, overhead lines
• Power/Municipal: steam boilers, condensate systems
• Cryogenic: with temperature-rated models (e.g. 1000HP LP) forming part of gas storage relief systems

Notable Features

• Wide pressure ranges: from ounces/in² to 740 psig
• Materials: broad compatibility for aggressive media
• High Cv capacity: large flow capability in compact regulators
• Diaphragm protection: travel stops prevent damage
• Serviceability: complete internal access via IOM manuals

Why Choose Cashco Regulator + Rupture Disc Assemblies

• Engineered pressure protection and controlled relief
• Robust, field-serviceable design with replaceable trim
• Broad pressure & temperature range—handles harsh environments
• High Cv capacity—efficient, compact solutions
• Compliance-ready when paired with rupture discs and ASME/API guidelines
• Backed by YGEN Engineering Ltd and YGEN Automation as authorized channel partners