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Hydraulic emergency shut-off valve QDY421F-25/40

Features

1. Suitable for gas or liquid ammonia pipelines, providing safety protection. When a pipeline leaks, use a hand-operated oil pump to relieve pressure and achieve remote control of valve closure. When a fire occurs, high temperatures cause the fusible plug

Technical Parameters



Technical parameters:


Nominal pressure MPa 2.5 4.0
Shell Test Pressure MPa 3.75 6.0
Seal test pressure MPa 2.75 4.4
Temperature -40℃~+150℃
Applicable Medium Ammonia, liquid ammonia, vinyl chloride, refrigerants, etc
Flange standard GB/T9113-2000
manufacturer's standard JB/T9092-1999
Emergency cut-off time ≤10~30秒
Melting temperature of fusible plug 75±5℃
Applicable medium for oil cylinder Synthetic spindle oil, transformer oil
Max MPa 4.0~6.0

Main component materials:

valve body valve stem Valve flap spring gasket hydro-cylinder sealing ring
WCB 20Cr13 20Cr13 20CrVA,1Cr18NI9 PTFE 20’ NBR

Hydraulic emergency shut-off valve QDY421F-25 nominal pressurePN2.5MPa External dimensions and connection dimensions

DN L D D1 D2 D3 bulge D4 concave b f Z-φ H1 H2
150 444 300 250 211 203 204 28 4.5 8-φ26 590 353
200 533 360 310 274 259 260 30 4.5 12-φ26 695 410
250 622 425 370 330 312 313 32 4.5 12-φ30 735 441