Bliss 31 Series – Pilot Operated Pressure Relief Valve

The Bliss 31 Series Pressure Relief Valve is a pilot-operated valve engineered for advanced overpressure protection in critical systems. Certified under ASME Section VIII and XIII, this valve ensures bubble-tight shutoff, adjustable blowdown, and excellent repeatability, all while reducing fugitive emissions. Available in Snap Acting or Modulating pilot types, the 31 Series is compatible with a wide pressure range (15 to 6170 psig) and temperature conditions (as low as -450°F). Its rugged, compact design, full port option, and interchangeable parts simplify installation and maintenance—making it ideal for diverse industries like Oil & Gas, Power, and Chemical Processing.

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Features

ASME Code Compliant (Section VIII & XIII)
Pilot-operated: Available in Snap Acting or Modulating controls
Full port and API orifice sizes (D through T)
Bubble-tight shutoff near set pressure
Adjustable blowdown
Wide operating range: -450°F to +450°F
Interchangeable and replaceable internal parts
NACE, Monel®, Hastelloy®, Duplex and Inconel® options

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Bulk Magnetic Level Gauge Manufacturer And Supplier For EPC & Industrial Projects

We specialize in bulk procurement contracts and long-term supply agreements

Our manufacturing capacity supports:

Multi-unit refinery installations
Storage tank farms
LPG & propane terminals
Chemical processing plants
Power plant boiler systems
Oil & gas separators

We provide:

Volume production scheduling
Project-based pricing
Batch certification
Framework supply contracts
Export-ready packaging

If your business requires high-volume magnetic gauges for plant expansion or infrastructure projects, we are equipped to deliver.

Pressure Safety Valve Manufacturer & Supplier - Bliss 31 Series

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Bliss is a direct manufacturer of the Bliss 31 Series Pressure Safety Valve, a pilot-operated type.

The 31 Series features an integrally cast, flanged body with a semi-nozzle design and a non-flowing pilot-control configuration. Valves are available in snap-acting and modulating pilot control types and are designed for air, gas, vapor, steam, and liquid service.

This is a manufacturer-supplied industrial product across Europe, not a reseller offering.

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Why Engineers Specify Bliss 31 Series Pressure Safety Valve

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Certified capacity by the National Board
ASME Section VIII & XIII compliance
ASME Pressure Vessel Code (UV)
API 526 dimensional interchangeability
Integrally cast flanged body
Non-flowing pilot control
Externally adjustable blowdown (snap-acting models)
Bubble-tight reseat with short and stable blowdown
Lower height and weight profile compared to the spring-loaded valve
Easy interchangeability of parts
Remote sensing connection available

Products Deployed In

Industries Served

Oil & Gas

Refineries, offshore platforms, storage tanks

Petrochemical & Chemical

Corrosive and hazardous liquid handling

Power & Utilities

Boiler drum level, condensate monitoring

Water & Wastewater

Reservoirs, treatment plants

Marine & Shipbuilding

Ballast and bilge tank level monitoring

Pharmaceuticals

Sterile and sanitary level control

Food & Beverage Processing

Tanks containing liquids like syrups, oils, and dairy

Pulp & Paper Industry

Cemical treatment tanks, bleach towers, and storage vessels

Pressure Safety Valve Manufacturer You Can Trust

All Bliss 31 Series valves are warranted free of defects in material and workmanship for: One year after installation, or Eighteen months from delivery.

For technical documentation, configuration matrix, and dimensional tables, refer to the Bliss 31 Series product leaflet.

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