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For Nuclear

Swing Type Main Steam Isolation Valve

Swing Type Main Steam Isolation Valve

Size 28 inch , 30 inch
Working pressure
temperature
7.5MPa / 291Ž
Material JIS SCPL 1 ( similar to ASTM LC B )
Weight Approx. 68,647 N
Summary As a main steam isolation valve for the PWR type reactor, this valve is provided at the outlet part of the steam generator, and is used to shut off the steam to prevent its release into the atmosphere at the time of an unforeseen accident such as breakage of the main steam pipe.
The photo shows a example.

Electric Motor Operated Wedge Gate Valve

Electric Motor Operated Wedge Gate Valve

Size 10 inch
Class 1500
Operating press 17.2MPa
Temp 343Ž
Material JIS SCS 14A isimilar to ASTM CF 8Mj
Summary The valve body is cast stainless steel and bolted bonnet type.
Valve operation is made by an electrical motor.
For leakage prevention the valve has a lip sealing welded bonnet construction.
Also, there are other types of welded seals such as an omega ring, or one having a double structure at the gland portion and provided with a leak off connecting pipe.
The photo shows a example.

Safety Valve for Pressurizer

Safety Valve for Pressurizer

Size 3 1/2 inch , 5 1/2 inch
Popping Pressure 17.2MPa
Popping Temperature Saturated Temp. ( 353Ž )
Material JIS SCS 14A isimilar to ASTM CF 8Mj
Summary This is a safety valve to be mounted with the pressurizer of the PWR type reactor; being a safety valve provided with high pressure bellows having the blowing]off pressure of 17.2MPa.
This valve, indispensable for the protection of the pressurizer from overpressure, is always exposed to radioactivity, so that all parts are made of high quality stainless steel.
The photo shows a example.

Pressure Relief Valve With Pilot Valve

Pressure Relief Valve With Pilot Valve

Popping Pressure 1.1 - 1.8MPa
Popping Temperature 195Ž`286Ž
Material JIS SCPH 2 (similar to ASTM WC B)
Summary This is a pressure relief valve to be used for the reheater ( moisture separator and cross-around) of large capacity turbines for both pressurized water (PWR) and boiling water reactors (BWR), having the blowing off pressure of 1.1 - 1.8MPa, the inlet size of 16 inch ] 22 inch and characteristic of the large size.