Ammonia special-purpose valve

Pneumatic emergency shut-off valve QDQ421F-25/40

Product Features

1. Suitable for gas or liquid ammonia pipeline, a safety protection.The delivery status, normally closed valve.Work air acting on the cylinder, the valve broken.
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

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 ~ + 50ºC
Applicable medium	Liquefied petroleum gas (LPG), vinyl chloride, liquid ammonia, etc
The standard of the flange	GB/T9113-2000
Manufacturing standards	JB/T9094-1999
Emergency cut-off time	10 ~ 30 seconds or less
Fusible plug melting temperature	75 + / - 5ºC
Applicable medium cylinder	Compressed air, nitrogen
Air pressure MPa	0.3 ~ 0.6

Main components:

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

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

DN	L	D	D1	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

Ammonia special-purpose valve

Pneumatic emergency shut-off valve QDQ421F-25/40

Product Features

Technical parameters

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