बटरफ्लाई वाल्व

Our offered Butterfly Valve Manual is extensively used to control the flow of liquid There is a metallic disc mounted perpendicular to the flow of fluid in the closed position When it disc is manually displaced it gives way to the fluid to flow through the valve Since it is made of the toprated metallic alloy that is immune to abrasion chemical attacks and oxidization the valve is suitable to use for abrasive fluids acids etc Furthermore our patrons can get this Butterfly Valve Manual from us at the pocketfriendly price

The special feature of valve is that the disc is mounted eccentrically in valve body Due to this the rubber seal on disc does not rub against the body seat ring in crack open position The shat axis is offset to the sealing plane The body seat ring is in the form of the frustum of a cone The disc and the seal are so dimensioned that in fully closed position the disc seal comes in the contact with the body seat ring thus giving drop tight shut off in both flow direction The salient features of these valves are as follows

11 SINGLE DOUBLE ECCENTRIC DISC SEAL SEAT GEOMETRY

111 SINGLE ECCENTRICITY Figure 2

In single eccentric design the valve shaft is located in such a way that it is offset to the plane of disc seal seating contour This offset eccentricity Single Eccentricity Double Eccentricity

Figure 2 e1 geometrically ensures detachment of the resilient seal from the body seat ring the moment the valve begins to get crack open This separation enables the resilient seal to travel over Seat Rings with minimum length of physical contact and consequent rubbing thereby increasing its wear life

and at the same time achieving leak tightness in fully closed condition Besides this quick separation of resilient disc seal from body seat ring reduces the torque requirement to rotate the disc from crack open to full open condition

General design manufacturing

Valve face to face dimensions

Top flange drilling

Valve inspection and testing

Flange standard conformity

EN 593

EN 593 API 609 category A Short wafer as per ISO 5752 Tab 5

ISO 5211

EN 12266 Part 1

DIN EN 1092 PN6 PN10 Class 150 JIS5K 10K

BS10 Tab D E IS 6392 Tab 11 17

Technicals Specification

1

2

3

4

5

6

7

8

9

10

Valve type

Body type

Seat type

End Connection

Size range

Pressure rating

Operating temperature range

Seat leakage

Operation

Standard Material of Construction MOC

Valve Body

Valve Disc

Seat liner

Drive end non end shaft

Centric Disc Rubber Lined Butterfly valve with a

single piece body

Short wafer sandwiched between flanges

Integrally moulded with the body

Wafer Sandwiched

DN40 to DN 300

PN16 max

250C to 800C

Tight shut of Bidirectional

Hand lever for sizes from DN40 to DN 300

CI IS 210 FG 260

SGI GGG 40

Nitrile

SS 410

Valve Feature

Integrally molded seat liner on the body which ensures excellent dimensional stability guaranteed seat tightness

Seat liner extending on to the contact faces ensures perfect sealing and eliminates the need for separate flange gaskets

Unique triple sealing system for shaft sealing ensures zero leakage of the media past the shaft seals

Narrow land disc ensures perfect sealing with least operating torque requirements

A fully universal body design ensures fitment of the valve between companion flanges of all popular standards ANSI BS DIN JIS IS etc

A ten position notch disc and hand lever ensures locking of the valve in 8 intermediate position in addition to closed and open position Hand lever lockable through pad lock for tamper proof positioning2j7

Body castings made of superior FG 260 grade cast iron to ensure additional strength

Valve disc made of ductile cast iron instead of cast iron to withstand against possible water hammer or pressure surges

A truly line size body bore to ensure maximum flow capacity with the lowest pressure drop

Shafts made of martensitic stainless steel to ensure maximum strength and torsional rigidity

Both top and bottom shaft swiveling are guided by self lubricated PTFE bearings

Fool proof handlever designed to prevent accidental pinching of hand between the handle and locking lever

FAQs of Cast iron Butterfly Valve: