First, The Pneumatic Three-way Shut-off Valve Overview
Pneumatic three-way shut-off valve with a top-oriented structure, with a multi-spring actuator. With a compact structure, light weight, sensitive action, the fluid channel was S streamlined, the pressure drop loss is small, the valve capacity is large, easy disassembly and so on. The shut-off valve accepts the signal from the regulating instrument, cuts off, turns on or changes the flow of the medium, and automatically controls the process parameters such as pressure, flow rate, temperature or level. Widely used in petroleum, chemical, metallurgical, power, light industry, textile and other industrial sectors of the production process of automatic control and remote control system.        This series of products are thin film, piston type two. The body structure has a single seat, sleeve, two-seat (two three links) three, sealed with a sealed seal and bellows seal two, the product nominal pressure level PN10,16,40,64 four, nominal caliber Range DN20 ~ 200mm. Applicable fluid temperature from -60 ~ 450 ℃. The leak level is grade IV or grade VI. The traffic feature is fast.

Second, Pneumatic Three-way Shut-off Valve Product Features
1, Cut off the valve with a multi-spring actuator and adjustment mechanism connected with three columns, the whole height can be reduced by about 30%, the weight can be reduced by about 30%. 2, the valve body according to the principle of fluid mechanics designed to equal section low flow resistance flow channel, rated flow coefficient increased by 30%.
3, The trim parts are tight and soft seal two kinds of tight type for the welding carbide, soft seal for the soft material production, close the sealing performance.
4, Balanced trim, to improve the allowable pressure difference between the shut-off valve.
5, Bellows seal on the movement of the stem to form a complete seal, blocking the possibility of media leakage. 6, the piston-type executive, the operating force, the use of large pressure.

Third, Pneumatic Three-way Shut-off Valve Main Parts Materials
Body, Seal Sleeve: HT200, ZG230-450 ZG1Cr18Ni9Ti ZGOCr18Ni12M02Ti 
Spool, Seat: 1Cr18Ni9Ti OCr18Ni12M02Ti 1Cr18Ni9Ti stacking Division too Lai alloy 
Sleeve, Valve plug: 1Cr18Ni9Ti OCr18Ni12M02Ti 1Cr18Ni9Ti stacking plant Taicai alloy 
Filler: polytetrafluoroethylene , Flexible graphite 
Corrugated Diaphragm: nitrile rubber clip reinforced polyester fabric 
Spring: 60Si2Mn 
Stem, putter: 2Cr13 , 1Cr18Ni9Ti spool, valve plug (soft): reinforced PTFE 
Corrugated pipe: 1Cr18Ni9Ti

Fourth, Pneumatic Three-way Shut-off Valve Specifications and Technical Parameters

Nominal Diameter DN (mm)		15	20	25	32	40	50	65	80	100	125	150	200
Rated Flow Coefficient KV	Single Seat, Two Seats	5	7	11	20	30	48	75	120	190	300	480	760
	Sleeve			11	20	30	48	75	120	190	300	480	760
Nominal Pressure PN (MPa)		1.0 1.6 4.0 6.4
Rated Travel (mm)		8				12		20		25	40		50
Effective Area (cm 2)	ZMQ type	100				200		400			600		1000
	ZSQ type	100			125			160			250
Allow Leakage	Hard seal 1 / h	- like: 10 -4 X valve rated capacity; tight type: single, two-seat: 1.2X10 -7 , sleeve 5X10 -6X valve rated capacity
	Soft seal	Class VI
Allowable Differential Pressure (MPa)	ZMQ PN is working	6.4	5.09	2.91	1.85	2.18	1.33	1.52	0.99	0.62	0.60	0.69	0.39
	ZMQ PN reacts	6.4	6.4	3.88	2.47	2.91	1.77	2.03	1.32	0.83	0.80	0.92	0.52
	ZSQ PN	6.4	6.1	3.5	2.3	3.0	1.9	1.9	1.5	0.93	0.84	0.65	0.47
	ZMS QM	Nominal Pressure
Signal Pressure (kPa)	ZMQ	0 or 250
	ZSQ	0 or 400 to 600

 1) The product performance indicators to implement GB / T4213-92; 
 2) Table to allow the pressure difference is greater than the nominal pressure is to take the nominal pressure value, less than or equal to the nominal pressure value is unchanged; 
 3) The table allowed to use the standard cylinder Value, can be equipped with different cylinders to increase the allowable pressure . 
 
Fifth, Pneumatic Three-way Shut-off Valve Dimensions and Weight
 

Nominal Diameter DN (mm)		15	20	25	32	40	50	65	80	100	125	150	200
A		ф 196				ф 232		ф 308			ф 394		ф 498
L	PN16, 40	130	150	160	180	200	230	290	310	350	400	480	600
	PN64	210	230	230	260	260	300	340	380	430	500	550	650
H	PN16, 40	305	340	345	370	380	390	475	490	500	765	825	927
	PN64	320	350	354	372	382	397	473	475	517	805	882	815
	Bellows Seal Type	375	409	414	431	441	468	555	570	613	855	915	1017
H1	PN16, 40	50	53	58	70	75	83	93	100	110	125	143	170
	PN64	60	65	70	77.5	85	90	100	85	125	148	170	208
H2	PN16	115	115	121	130	140	153	178	190	200	260	320	360
	PN40	125	125	130	140	150	160	185	200	220	280	320	380
	PN64	150	150	160	170	180	200	230	250	282	310	430	480
H3	PN16, 40	404	415	428	448	468	561	578	590	886	1008	1120
	PN64	365	430	498	528	528	530	535	540	600	890	1208	1305
	Bellows Seal type	395	465	478	509	509	548	641	658	670	976	1098	1210
Weight (kg)	Standard Type	10	10	12	15	18	23	35	45	60	75	90	120
	Bellows seal Type	12	12	14	17	20	26	38	48	64	79	95	125

 

Six, Pneumatic Three-way Shut-off Valve Implementation Of The Standard

 1, Flange standard: Cast Iron Flange GB4216-84 cast steel flange according to GB9113-88, JB / T79-94 
 2, Flange Sealing SurfaceType: PN10, PN16 for the convex; PN40, PN64 for the convex surface, the valve body For the concave 
 3, The Length Of The Structure: GB12221-89 
 4, The Implementation Of The Body Air Signal Interface: Internal thread M10X1 
 5, The Valve Body Flange And Flange End Distance can be specified by the user standard. Such as: ANSI, JIS, DIN and other standards