pneumatic diaphragm double-seated control valve (ANSI ,API,GB)

1. advanced equipment 2. strong commonality 3. compact form 4. reliable in use 5. matching spool are provided

It widely used in chemical, petroleum, power plants, light industry, textile, metallurgical industrial production.

  

 pneumatic diaphragm double-seated control valve

Main parts materials: Valve body, valve cover: ZG230-450, ZGlCr18Ni9Ti Spool, the valve seat: 1Cr18Ni9T,  Levin Titanium Alloy Welding Division + 1Cr18Ni9Ti 

stuffing : PTFE  flexible graphite PTFEGasket: Rubber,, graphite spiral wound gasket Membrane covered: A3   1Cr18Ni9TICorrugated Diaphragm: NBR folder enhanced polyester fabric Spring: 60Si2Mn Stem, putting: 2Cr13, 1Cr18Ni9Ti 

Specification and technical data
DN		20	25	32	40	50	65	80	100	125	150	200
rated flow coefficient Kv	line	7.6	12.1	19.4	30.3	48.3	75.9	121	193.6	302.5	484	759
	percentage	6.9	11	17.6	27.5	44	69.3	110	176	275	440	693
actuator	drect action	PZMA-4		PZMA-5			PZMA-6			PZMA-7
	Reverse action actuator	PZMB-4		PZMB-5			PZMB-6			PZMB-7
stroke		16		25			40			60
diaphragm Ae(cm2)		280		400			600			1000
PN		1.6  4.0  6.4  10.0(Mpa)   ANSI 150 300 400 600
inheret flow coefficient		Linear     percentage
inerent ajustment		50
signal(kpa)		20-100     40-200     80-240
air supply		0.14    0.25  0.28  0.40

 

Performance index
number	item			stanard control valve		hot&low temperature control valve
				no positioner	positioner	no positioner	positioner
1	intrinsic error<(%)			±5	±1	±15	±4
2	Hysteresis<(%)			3	1	10	3
3	Dead<(%)			3	0.4	8	1
4	Deviation<(%)	open	start	±2.5	±1	±6	±2.5
			end	±5		±15
		close	start	±5		±15
			end	±2.5		±6
5	rated stroke deviation<(%)			±2.5	±2.5	±6	±2.5

Ordering Information:1. Product name and model2. DN3. Rated flow coefficient KV4. Nominal pressure and differential pressure5. Valve and valve components of materials6. Connection7. Transmission8. Flow characteristics9. Suitable temperature

pneumatic diaphragm double-seated control valve (ANSI ,API,GB)