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QDQ421F Pneumatic Emergency Shutoff Valve

Shijiazhuang High & Middle Pressure Valves Manufacturer

QDQ421F Pneumatic Emergency Shutoff Valve
Product image: Shijiazhuang High & Middle Pressure Valves Manufacturer

Product overview

Normally closed gas-station shutoff valve opened by pilot air pressure.

The QDQ421F is described as a normally closed emergency shutoff valve for gas-system piping. Applied air pressure opens the valve; unloading the pilot pressure allows it to close. The supplier also describes a fusible-plug shutdown arrangement. The source specifies one-direction shutoff and requires the line flow to match the body marking.

Control Valve category

Published specifications

Model heading
QDQ421F-25/40
Nominal-pressure entries
2.5 and 4.0 MPa
Temperature entry
−40 to +50°C
Pilot gas
Compressed air or nitrogen
Pilot pressure entry
0.3–0.6 MPa

Selection points

Supplier & product source

Shijiazhuang High & Middle Pressure Valves Manufacturer · Shijiazhuang, Hebei

View the supplier’s original product page

Source reviewed: 2026-11-07. This directory summary organises the supplier’s published product information.

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