Pneumatic double seated control valve

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Pneumatic double seated control valve Feature

Pneumatic double seated control valve use top-guide structure, equipped with multi-spring actuator. Impact structure, light weight, flexible action, S-type streamline channel, small loss of pressure drop, large capacity, precise flow characteristics, convenient assembly. Pneumatic double seated control valve is widely used for controlling gas, liquid, processing parameters, like pressure, flow, temperature, liquid, keep them at the given value. This series of pneumatic double seated control valvecontain standard, adjusting cut-off, bellows sealing, jacket insulation; nominal pressure: PN10、16、40、64; nominal diameter: DN20~400, fluid temperature: -200℃~560℃; Pneumatic double seated control valve leakage level: IV level or VI level; flow characteristics: linear or equal percentage

Pneumatic control valve Body type:	straight through casting globe type
Spool type:	balanced double seated 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 double seated 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/304/316/316L

Pneumatic double seated control valve Flow characteristic	Linear, percentage, quick open
Allowable range	50: 1
Rated Cv value	Percentage CV10~1400 ，linear CV11~1500
Pneumatic double seated control valve Allowable leakage	Metal seal:Ⅱgrade（0.5% rated capacity） Soft seal: V grade Leakage standard: GB/T 4213
Pneumatic double seated control valve Performance
Intrinsic error (%)	±1.0
Return difference(%)	≤1.0
Dead zone(%)	≤1.0
Difference from beginning to end point(%)	±2.5
Rated travel difference(%)	≤2.5

Special test	Material penetration flaw detection (PT), radiator test (RT), flow characteristic test, low temperature test.
Special treatment	Trim nitrogen treatment, seat hard alloy treatment.
Special rinse	Degreasing and dehydration treatment
Special condition	Special piping or connection, vacuum condition, S.S fastener, special coating.
Special dimension	Customized face to face length or dimension
Test and inspection	Third party test report

Pneumatic 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 double seated 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）		25	32	40	50	65	80	100		125	150	200	250	300
Rated Cv	Percentage	10	16	25	40	63	100	160		250	400	630	1000	1400
Rated Cv	Linear	11	17.6	27.5	44	69	110	176		275	440	690	1100	1500
Nominal size	Travel	Option flow coefficient, Cv（★standard ●recommended ○customized）
DN25	16 mm	★
DN32	25 mm	○	★
DN40		○	●	★
DN50		○	●	●	★
DN65	40mm		○	○	○	★
DN80			○	○	○	●	★
DN100			○	○	○	●	●	★
DN125	60mm					○	○	○		★
DN150							○	○		●	★
DN200							○	○		●	●	★
DN250	100mm									○	●	●	★
DN300	100mm										○	●	●	★
Pneumatic actuator,Diaphragm effective area, Ae (cm2)		ZHA/B-23				ZHA/B-34			ZHA/B-45				ZHA/B-56
Pneumatic actuator,Diaphragm effective area, Ae (cm2)		350				560			900				1600
Action	Spring range	Pneumatic double seated control valve Metal seal allowable pressure difference（MPa）
Air to open	20-100KPa	3	2.25	2.25	1.95	2.36	2.04	1.67		1.41	1.41	1.14	0.65	0.55
	40-200 KPa	6.4	6.4	6.4	6.4	6.4	6.4	6.4		6.4	6.4	6.4	1.55	1.4
	80-240 KPa	6.4	6.4	6.4	6.4	6.4	6.4	6.4		6.4	6.4	6.4	4.08	4.08
Air to close	20-100KPa	1.5	1.13	1.13	0.98	1.18	1.02	0.84		0.71	0.71	0.57	0.65	0.55
	40-200 KPa	4.5	3.38	3.38	2.93	3.54	3.06	2.51		2.12	2.12	1.71	1.8	1.55
	80-240 KPa	6.4	6.4	6.4	6.4	6.4	6.4	5.85		4.94	4.94	4	4.08	3.65

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