Special valves series for gas transportation

Pneumatic emergency cut-off valve (Marine) QDQ421 F - 25/40

Product Features

1, suitable for gas pipeline, a safety protection.The delivery status, normally closed valve.Work air acting on the cylinder, the valve open.
2, on the principle of check valve, one-way only cut off, the flow direction of medium when installation must be consistent with the body logo.
3, when the pipeline leakage by air pressure relief, realizing remote control valve is closed.When a fire, high temperature melt fusible plug, the valve automatically shut off.
4, easy operation, the valve closed check fast.

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
Suitable temperature	- 40ºC to + 50ºC
Applicable medium	Liquefied petroleum gas, natural gas, liquid ammonia, etc
The standard of the flange	GB/T9113__2000
Manufacturing standards	JB/T9094-1999
Emergency cut-off time	10 to 30 seconds or less
Easy to melt melting temperature	75 + / - 5 ºC
Applicable medium cylinder	Compressed air, nitrogen
Air pressure Mpa	0.3 to 0.6

The major parts material

The valve body	The valve stem	The disc	spring	gasket	cylinder	Sealing ring
WCB	20Cr13	20Cr13	50CrVA��1Cr18Ni9	PTFE	20 #	NBR

Standing with pneumatic emergency cut-off valve QDQ421F nominal pressure PN2.5 Mpa shape size and the connection size

DN	L	D	Dl	D2	D3 convex	D4 concave	b	f	Z - phi d	H1	H2
150	444	300	250	211	203	204	28	4.5	8 - phi 26	730	353
200	533	360	310	274	259	260	30	4.5	12 - phi 26	850	410
250	622	425	370	330	312	313	32	4.5	12-30	899	441

Special valves series for gas transportation

Pneumatic emergency cut-off valve (Marine) QDQ421 F - 25/40

Product Features

Technical parameters

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