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Carbon Steel On Off Flanged Butterfly Valve , Pneumatic Butterfly Valve Triple Offset

Pneumatic piston triple offset carbon steel on-off butterfly valve with handwheel

General

ZSHWE/ ZDRWE Series triple offset butterfly valve provides a bidirectional bubble tight shut-off to API 598. This geometry ensures that the disc seal contacts the seat only at the final shut-off position without rubbing or galling, providing a torque generated resilient seal with sufficient “wedging” to ensure a uniform seal contact. Our butterfly valves are widely used in the chemical, power, light textile, food, pharmaceutics, pulp and paper and other severe application.

Specification:

Nominal Pressure: Class 150lb,300lb；

Nominal diameter range:DN80～1200(3”～48”)；

Fluid temperature range:-60～+450℃；

Flow characteristic is approximate equal percentage.

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；

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	620	1150	2030	3150	4550	6200	8100
Pneumatic	Single acting	100	100	125	143	160	190	210	240	270
Torque(Nm)	50	50	100	200	300	400	600	1000	1600
Double acting	83	83	100	125	143	160	190	210	240
Torque(Nm)	50	50	100	200	300