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By type: Safety valve/Relief valve

Open safety valve

Nominal diameter (mm) 40–200
Fluid Steam
Pressure range 0.1–42.9 MPa max.
Temperature range 650°C max.
Materials Carbon steel, Cr-Mo steel (JIS, ASME and ASTM standards and interpretation of technical standards for steel for thermal power generation equipment)

Sealed relief valve

Nominal diameter (mm) 20–200
Fluid Gas, liquids (water), steam
Pressure range 0.1–46.2 MPa *1
Temperature range Room temperature to 373°C *1
Materials Carbon steel, Cr-Mo steel, stainless steel (JIS, ASME and ASTM standards)
*1
Pressure range and temperature range vary with the fluid.

Electromagnetic relief valve (PCV)

Nominal diameter (mm) 50•65
Fluid Steam
Pressure range 42.9 MPa max.
Temperature range 650°C max.
Materials Cr-Mo steel (JIS, ASME and ASTM standards and interpretation of technical standards for steel for thermal power generation equipment)

General-purpose safety valve (type S1627)

Nominal diameter (mm) 20•25•40•50
Fluid Steam, gas (air, nitrogen)
Pressure range 0.1–2.2 MPa
Temperature range Room temperature to 225C
Materials JIS SCS13A

Pressurizer safety valve

Nominal diameter (mm) 100•150
Fluid Steam
Pressure range 17.16 MPa *2
Temperature range 353°C (saturation temperature) *2
Materials JIS SCS14A
*2
Actual delivered value

Vacuum relief valve

Nominal diameter (mm) 300•500
Fluid Steam
Pressure range 0.0005 to 0.0007 MPa (Open valve differential pressure) *2
Temperature range 141°C max. *2
Materials JIS SF490A, SCPH2
*2
Actual delivered value

Main steam safety valve

Nominal diameter (mm) 100•125•150
Fluid Steam
Pressure range 7.46–8.58 MPa *2
Temperature range 292–301°C (saturation temperature) *2
Materials JIS SCPL1
*2
Actual delivered value

Moisture Separator Reheater Relief Valve

Nominal diameter (mm) 400•600
Fluid Steam
Pressure range 1.07–1.59 MPa *2
Temperature range 195–316C *2
Materials JIS SCPH2
*2
Actual delivered value

Cross-around pipe safety valve

Nominal diameter (mm) 550
Fluid Steam
Pressure range 1.52–1.69 MPa *2
Temperature range 256–260C *2
Materials JIS SCPH2
*2
Actual delivered value
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