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 top-rated 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 pocket-friendly 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:
1.1 SINGLE / DOUBLE ECCENTRIC DISC SEAL SEAT GEOMETRY
1.1.1 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
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 positioning.2j7
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.