Pneumatic Diaphragm Modulating Control Valve

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Wechat:17717520739
Email：info@shxvalve.com

Address: NO.720, Suide Road, Jiading District,Shanghai, China.

Model：

Pneumatic Diaphragm Modulating Control Valve Feature

Pneumatic Diaphragm Modulating Control Valve is compact structure, wide adjustable range, high accuracy of flow control;Large guide area for valve spool, with excellent anti vibration feature;Pneumatic Diaphragm Modulating Control Valve is equipped with multi-spring diaphragm actuator, with small size &large output force feature;Pneumatic Diaphragm Modulating Control Valve is applicable for high temp, low temp & small pressure differential of front-after valve with requirement of high closure performance and reliability.

Pneumatic control valve Body type:	straight through casting globe type
Spool type:	non-balanced single seat plug type
Nominal size:	DN20~200,、 NPS 3/4〞~ 8〞
Nominal pressure:	PN16 ~ 100、 CLASS 150LB ~ 600LB
Connection: flange:	FF、RF、MF、RTJ
Welding:	SW、BW
Flange dimension:	According to to IEC 60534
Pneumatic Diaphragm Modulating control valve Bonnet type:	Ⅰ:standard type（-20℃~230℃） Ⅱ:Radiator type: （-45℃~ high than 230℃ occasion） Ⅲ:Low temperature extended type（-196℃~ -45℃） Ⅳ:Bellow seal type Ⅴ:Warm insulation Jacket type
Packing:	V type PFTE packing, flex. graphite packing, etc.
Gasket:	Metal graphite packing
Actuator:	Pneumatic: multi-spring diaphragm actuator, piston type actuator.

Component name	Control Valve Material
Body/Bonnet	WCB/WCC/WC6/CF8/CF8M/CF3M
Valve spool/Seat	304/316/316L(overlaying stellite alloy)
Packing	Normal:-196～150℃ is PTFE,RTFE,>230℃ is flexible graphite
Gasket	Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket
Diaphragm Cover	Normal:Q235,Special:304
Diaphragm	NBR with reinforced polyester fabric
Spring	Normal:60Si2Mn,Special:50CrVa
Control valve stem	2Cr13/17-4PH/304/316/316

Pneumatic Diaphragm Modulating Control Valve Flow characteristic	Linear, percentage, quick open
Allowable range	50: 1 (CV<6.3 30: 1)
Rated Cv value	Percentage CV1.6~630 ，linear CV1.8~690
Pneumatic control valve Allowable leakage	Metal seal: IV grade（0.01% rated capacity） Soft seal: VI grade（foam grade） Leakage standard: GB/T 4213
Pneumatic Diaphragm Modulating Control Valve Performance
Intrinsic error %		±1.5
Return difference, %		≤1.5
Dead zone, %		≤0.6
Difference from beginning to end point, %		±2.5
Rated travel difference, %		≤2.5

Control Valve Type\ Method	Pneumatic diaphragm actuator
	ZH23～ZH56
	Multi-spring type
Usage	Regulating type, ON-OFF type
Air supply pressure or Power supply voltage	Air supply pressure (Spring range) 140（20～100）Kpa G 240 (40～200) Kpa G 280 (80～240) Kpa G
Connector	Air pipe connector: RC1/4
Direct action	Pressure increase, stem descend, valve close.
Reaction	Pressure increase, stem ascend, valve open.
Input signal	40～20mA.DC（with positioner）
Lag	≤1%FS（with positioner）
Linear type	2%FS（with positioner）
Environmental temperature	-10℃～+70℃
Pneumatic control valve Accessories	E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch Non-standard accessories, need special customized notes.

Seat diameter(mm)		10	12	15	20	25	32	40	50	65	80	100	125	150	200
Rated Cv	Percentage	1.6	2.5	4.0	6.3	10	16	25	40	63	100	160	250	400	630
Rated Cv	Linear	1.8	2.8	4.4	6.9	11	17.6	27.5	44	69	110	176	275	440	690
Nom. size	Travel	Option flow characteristic Cv. (★standard ●recommanded ○customized)
DN20	16mm	●	●	●	★
DN25	16mm	●	●	●	●	★
DN32	25 mm	○	○	○	○	○	★
DN40			○	○	○	○	●	★
DN50				○	○	○	●	●	★
DN65	40mm						○	○	○	★
DN80							○	○	○	●	★
DN100							○	○	○	●	●	★
DN125	60mm									○	○	○	★
DN150											○	○	●	★
DN200											○	○	●	●	★
Pneumatic actuator Diaphragm area, Ae(cm2)		ZHA/B-22					ZHA/B-23			ZHA/B-34			ZHA/B-45
Pneumatic actuator Diaphragm area, Ae(cm2)		350					350			560			900
Action	Spring range	Metal sealing allowable pressure difference (MPa)
Air open	20-100KPa	4.46	3.09	1.98	1.16	0.7	0.44	0.28	0.18	0.17	0.11	0.07	0.07	0.05	0.03
	40-200 KPa	6.4	6.4	5.94	3.34	2.14	1.31	0.84	0.53	0.51	0.33	0.21	0.22	0.15	0.09
	80-240 KPa	6.4	6.4	6.4	6.4	4.99	3.05	1.95	1.25	1.18	0.78	0.5	0.51	0.36	0.21
Air close	20-100KPa	6.4	6.19	3.96	2.23	2.14	0.87	0.56	0.35	0.34	0.22	0.14	0.15	0.1	0.06
	40-200 KPa	6.4	6.4	6.4	6.4	6.4	5.86	3.64	2.3	2.21	1.43	0.91	0.95	0.66	0.37
	80-240 KPa	6.4	6.4	6.4	6.4	6.4	6.4	5.04	3.18	3.06	1.98	1.26	1.32	0.92	0.52

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