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Certification:CE,TRCU,ISO9001

3 Way Ball Valve Stainless Steel , Shut Off  Pneumatic Actuator Butterfly Valve

Pneumatic piston triple offset control butterfly valve

ZSHWE Series of Three Eccentric Butterfly Valve, both valve disc and three sealing ring are designed in special three eccentric structure,with characteristics of impact structure, good shut-off performance and long operation life etc, so it has both regulating and shut-off functions; Due to the adoption of the three eccentric structure design, when it is  opening and closing, the valve plate and the sealing ring can be quickly disengaged (without friction design), which effectively prevent the seal ring from wearing; The valve seat and the sealing ring adopt the replaceable structure design, allowed client to repair and replace conveniently; Its low torque advantage, can really realize the bidirectional zero leakage, small flow resistance and large rated flow coefficient which could be widely used to cut off and regulate the processing fluids, such as metallurgy, oil,chemical engineering,electric power,natural gas.

Characteristics

One-piece casted body with the feature of compact structure and lightweight； The triple offset valve advanced design features three-way eccentricity and unique elliptical seat geometry ensuring compressive sealing around the entire seat and a tight, bubble free valve. Sealing ring design is novel, concise, free repair； Stainless steel and graphite laminated seal ring provides reliable, zero leakage, bi-directional shutoff； Triple offset structure ensure non-rubbing rotation, minimizing torque required and maximizing seat/seal ring lifetime；

Table 1

Item	Part	Materials
1	Seat	304,316+STL
2	Laminated seal ring	304+Graphite,304+PTFE
Metal to metal seat ring	304,316+STL
3	Cover	ZG2Cr13
4	Body	WCB,CF8,CF8M
5	Retaining plate	WCB,CF8,CF8M
6	Retaining ring	WCB,CF8,CF8M
7	Disc	WCB,CF8,CF8M
8	Stem	2Cr3,17-4PH
9	Bearing	QAL9-4

Main Performance Parameter

Table 2

Item	Description	Pneumatic triple offset butterfly valve	Electric triple offset  butterfly valve
1	Basic error＜(%)	±2.5	±2.5
2	Hysteresis＜(%)	2.5	2.0
3	Dead zone＜(%)	2.0	3.0
4	Travel difference between start and end＜(%)	Start	±2.0	±1.5
End
5	Rated angle deviation＜(%)	+2.5	+0.5
6	Rated flow coefficient deviation＜(%)	+10

Specification and Technical Data

Table 3  Rated flow coefficient

DN(mm)	80	100	125	150	200	250	300	350	400
Rated Kv	200	405