Product Description

Pneumatic bellows regulating valve is composed of multi-spring pneumatic membrane actuator and bellows sealing regulating valve body. The spool of the bellows control valve adopts an upper guide structure, which is compact in structure and has an S-streamline flow channel, which makes the pressure drop loss small, the flow rate is large, the adjustable range is wide, and the flow characteristic accuracy is high. The upper bonnet adopts a bellows sealing structure. , to ensure the sealing performance. It is suitable for the regulation of flammable, explosive, volatile, highly permeable and rare precious metal media. In addition, the pneumatic bellows regulating valve can also be used in vacuum applications.

Product Features

1. The double sealing structure of bellows packing is adopted to achieve better safety and reliability without leakage; more reasonable material matching can be selected according to the temperature or pressure of on-site use.2. It is suitable for the regulation of flammable, explosive, volatile, highly permeable and rare precious metal media. The bellows packing double seal can also be used for regulation on vacuum piping.

The main technical parameters

DN		20	25	32	40	50	65	80	100	125	150	200	250	300
Seat Diameter(dn)		20	25	32	40	50	65	80	100	125	150	200	250	300
KV	Single seat	6.9	11	17.6	27.5	44	69	110	176	275	440	630	875	1250
	Sleeve	6.3	10	16	25	40	63	100	155	250	370	580	900	1300
Allowable differential pressure(MPa)	Single seat	3.8	3.2	3.0	2.0	1.8	1.5	1.4	1.0	0,7	0.6	0.5	0.3	0.1
	Sleeve	6.4	6.4	5.2	5.2	4.6	4.6	3.7	3.7	3.5	3.1	3.1	2.6	2.2
PN(MPa)		1.6、2.5、4.0、6.4
L(mm)		16			25		40			60			100
Actuator model		ZHA/B-22		ZHA/B-23			ZHA/B-34			ZHA/B-45			ZHA/B-56
Bonnet form		Bellows seal type -40～+350℃
Gland form		Bolt compression
seal packing		V-type PTFE packing, V-type flexible graphite packing
Spool form		Single seat type, sleeve type
Flow characteristics		Equal percentage, straight

Actuator technical parameters

Configure Actuator Class	ZHA/B multi-spring diaphragm actuator
Actuator model	ZHA/B-22	ZHA/B-23	ZHA/B-34	ZHA/B-45	ZHA/B-56
Effective area(cm2)	350	350	560	900	1400
L(mm)	10、16	24	40	40、60	100
Spring range(KPa)	20～100（standard）、20-60、60-100、40-200、80-240
Diaphragm material	Nitrile rubber with nylon cloth, ethylene propylene rubber with nylon cloth
Air supply pressure	140～400KPa
Air supply interface	RC1/4"
ambient temperature	-30～+70℃
Accessories available	Positioner, air filter pressure reducer, position retaining valve, travel switch, valve position transmitter, hand wheel mechanism, etc.
Form of action	Air-to-close (B)—valve open (FO) when gas is lost; air-to-open (K)—valve to be closed when gas is lost (FC)

Main performance indicators

Project			Without locator	With locator
Basic error%			±5.0	±1.0
Return difference%			3.0	1.0
Dead zone%			3.0	0.4
Always point deviation%	Electric switch	Start point	±2.5	±1.0
		Start point	±5.0	±1.0
	Air to close	Start point	±5.0	±1.0
		Snd	±2.5	±1.0
Rated stroke deviation %			≤2.5
Leakage L/h			0.01%×valve rated capacity
Adjustable range R			30：1

Material of main parts

1	Body	WCB	304	316	316L
2	Gasket	PTFE\Graphite Gasket	PTFE\Graphite Gasket	PTFE\Graphite Gasket	PTFE\Graphite Gasket
3	Seat / Sleeve	304	304	316	316L
4	Spool	304	304	316	316L
5	Guide sleeve / cap	304	304	316	316L
6	Middle pad	PTFE\Graphite Gasket	PTFE\Graphite Gasket	PTFE\Graphite Gasket	PTFE\Graphite Gasket
7	Cap	WCB	304	316	316L
8	Stem	304	304	316	316L
9	Bellows	304	304	316	316L
10	Filler	PTFE/Graphite	PTFE/Graphite	PTFE/Graphite	PTFE/Graphite
11	Packing gland	WCB	304	316	316L

Main external connection dimensions

DN(mm)		20	25	32	40	50	65	80	100	125	150	200
L	PN16/25	181	184	200	222	254	276	298	352	410	451	600
	PN40	194	197	200	235	267	292	317	368	425	473	610
	PN64	206	200	210	251	286	311	337	394	440	508	650
H	PN16/25	52.5	57.5	75	75	85.5	92.5	100	110	142.5	158	170
	PN40	52.5	57.5	75	75	82.5	92.5	100	117.5	150	167.5	187.5
	PN64	65	40	85	85	90	102.5	107.5	125	172.5	195	207.5
H1		365	365	425	430	445	660	680	690	748	740	780
H2		298	298	298	298	298	380	380	380	510	510	510
H3		180	180	180	180	180	236	236	236	310	310	310
L1		289	289	289	289	289	347	347	347	476	476	476
A		282	282	282	282	282	360	360	360	470	470	470
D		220	220	220	220	220	270	270	270	320	320	320