Pneumatic PTFE lined bellow seal control valve

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Pneumatic PTFE lined bellow seal control valve Feature
Pneumatic PTFE lined bellow seal control valve is especially suitable for very corrosive media under low pressure and normal temperature service conditions.Pneumatic PTFE lined bellow seal control valve is a suitable and economic valve for corrosive application.

Pneumatic PTFE lined bellow seal control valve is composed of pneumatic diaphragm actuator,straight through single seat PTFE (PTFE,FEP,PFA is optional) Lined structure.Pneumatic PTFE lined bellow seal control valve contacted with the corrosive medium adopts the corrosion-resistant, anti-aging PTFE, the high pressure lining fluorine plastic process.Pneumatic PTFE lined bellow seal control valve is capable of controlling the flow of acid, alkali, aqua wang and other highly corrosive media, toxic volatile gas and liquid media.Therefore, Pneumatic PTFE lined bellow seal control valve is widely used in chemical, metallurgy, medicine and other industries.

Pneumatic PTFE lined bellow seal control valve Body type:	straight through casting globe type PTFE lined (PTFE,FEP,PFA is optional)
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 PTFE lined bellow seal control valve Bonnet type:	Ⅰ:standard type（-29℃~150℃）
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/CF8/CF8M/CF3M
Lined Material	PTFE(PTFE,FEP,PFA is optional)
Control Valve spool/Seat	304/316/316L Lined PTFE/FEP/PFA
Packing	PTFE
Gasket	PTFE
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 PTFE lined bellow seal control valve Flow characteristic	Linear, percentage, quick open
Allowable range	30: 1
Rated Cv value	Percentage CV6.3~400 ，linear CV6.9~440
Pneumatic PTFE lined bellow seal control valve Allowable leakage	Soft seal: VI grade（foam grade） Leakage standard: GB/T 4213
Pneumatic PTFE lined bellow seal 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

Pneumatic PTFE lined bellow seal control valve Type\ Method	Pneumatic diaphragm actuator
	ZH23～ZH56
	Multi-spring type
Pneumatic control valve 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.

Nominal size, DN		20	25	32	40	50	65		80	100	125	150
Rated flow coefficient, Cv	Percentage		8	12	20	32	50		70	100	200	240
Rated flow coefficient, Cv	Linear	5	10	16	25	38	63		80	120	220	300
Travel		16mm		25 mm				40mm			60mm
Pneumatic actuator Diaphragm effective area, Ae (cm2)		ZHA/B-22		ZHA/B-23			ZHA/B-34				ZHA/B-45
		350		350			560				900
Action	Spring range	Pneumatic PTFE lined bellow seal control valve Max. allowable pressure difference（MPa）
Air open	20-100KPa	1.16	0.7	0.44	0.28	0.18	0.17		0.11	0.07	0.07	0.05
	40-200 KPa	3.34	2.14	1.31	0.84	0.53	0.51		0.33	0.21	0.22	0.15
	80-240 KPa	6.4	4.99	3.05	1.95	1.25	1.18		0.78	0.5	0.51	0.36
Air close	20-100KPa	2.23	2.14	0.87	0.56	0.35	0.34		0.22	0.14	0.15	0.1
	40-200 KPa	6.4	6.4	5.86	3.64	2.3	2.21		1.43	0.91	0.95	0.66
	80-240 KPa	6.4	6.4	6.4	5.04	3.18	3.06		1.98	1.26	1.32	0.92

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