FISHER™ 3620JP
General Specifications:
Model: 3620JP Pilot-Operated Safety Relief Valve
Design Standard: JIS B 8210
Operation Type: Pilot-Operated
Main Valve Specifications:
Valve Size: Larger JIS sizes to handle higher flows (e.g., 80A, 100A, 125A, 150A, 200A).
Pressure Rating: JIS high-pressure classes (e.g., 16K, 20K, 30K, 40K, 63K).
End Connections: JIS Flanges (e.g., JIS 20K, 30K RF flange facing).
Orifice Area: Larger orifice sizes to meet high-capacity demands.
Pilot Specifications:
Pilot Types:
Standard Pilot: For general steam and gas service.
Balanced Piston Pilot: For applications with high or variable backpressure.
Liquid Service Pilot: For liquid applications.
Set Pressure Range: Capable of higher set pressures compared to the 3610JP series.
Performance Characteristics:
Accumulation (Overpressure): Typically 3% for steam (per JIS B 8210).
Blowdown: Adjustable.
Backpressure Capability:
Standard: Limited built-in backpressure capability.
Balanced: Can handle high levels of variable backpressure (e.g., up to 50% or more of inlet pressure) when equipped with a balanced pilot.
Materials of Construction:
Main Valve Body: SCPH 2 Cast Steel (Standard), with options for higher grades like SCPH 32 for high-temperature service.
Internals (Piston, Seat): Stainless Steel with optional hardened trim for erosive services.
Pilot: Stainless Steel and Brass.
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