Design & Manufacture:API 520, ISO 4126

Face to Face:API 526, En558 or DIN 3202

Inspect & Test:API 527, DIN 3230 or ISO 5208

Standard:API, ISO, BS, JIS, DIN, EN

Size Ranges: 1/2-12"

Pressure Class: ANSI150, ANSI300, ANSI600, ANSI900, ANSI1500, ANSI2500

Applicable Medium: Water, Petroleum, Gas

Applicable temperature: -20- 540C

Materials in Brass, Bronze, Carbon Steel, Stainless Steel etc.

ASME I valve - A safety relief valve conforming to the requirements of Section I of the ASME pressure vessel code for boiler applications which will open within 3% overpressure and close within 4%. It will usually feature two blowdown rings, and is identified by a National Board 'V' stamp.

ASME VIII valve - A safety relief valve conforming to the requirements of Section VIII of the ASME pressure vessel code for pressure vessel applications which will open within 10% overpressure and close within 7%. Identified by a National Board 'UV' stamp.

Low lift safety valve - The actual position of the disc determines the discharge area of the valve.

Full lift safety valve - The discharge area is not determined by the position of the disc.

Full bore safety valve - A safety valve having no protrusions in the bore, and wherein the valve lifts to an extent sufficient for the minimum area at any section, at or below the seat, to become the controlling orifice.

Conventional safety relief valve - The spring housing is vented to the discharge side, hence operational characteristics are directly affected by changes in the backpressure to the valve.

Balanced safety relief valve - A balanced valve incorporates a means of minimising the effect of backpressure on the operational characteristics of the valve.

Pilot operated pressure relief valve - The major relieving device is combined with, and is controlled by, a self-actuated auxiliary pressure relief device.

Power-actuated safety relief valve - A pressure relief valve in which the major pressure relieving device is combined with, and controlled by, a device requiring an external source of energy.