Butterfly valve 단면도

ISO 5211 Mounting Flange
Universal mounting dimensions simplify valve actuation. Allows for direct mounting of several actuators
Rocker Packing
Gland Shaped packing gland compensates for uneven adjustment of gland nuts.
Stem Packing
V-ring PTFE, UHMWPE or flat graphite provides positive sealing.
Extended Neck
Allows for 2” of pipe insulation.
Body
Robust one-piece casting in WCB carbon steel or CF8M stainless steel.
Available in wafer & lug style.
Positive Cast Disc Stop
Prevents seat damage from over-travel of the disc beyond the closed position. (not visible)
Seat Retainer
Reliable multi-bolt retainer holds and supports the seat. Standard valves are suitable for bi-directional
dead-end service at the full pressuretemperature rating of the valve. Same material as body material.
End Cap Seal
Made of PTFE, UHMWPE or graphite.
Thrust Ring
Centers the disc. Ensures tight shutoff and long service life. Made of 316 SS.
Bearing (lower)
Full length provides maximum stem support.
Made of 316 SS/PTFE
Disc
Standard material is 316 stainless steel.
Tangential Disc Pins
17-4 PH stainless steel disc pins are tangentially positioned, placing them in compression rather than shear. This
robust joint design eliminates potential failure of the disc-stem connection.
Seat
An advanced free floating, pressure assisted, solid seat design provides an interference and pressure
assisted seal. This creates a positive seal under both low and high pressure requirements. The seat does not rely on any secondary components to hold it in place, assuring longer service life with less maintenance.
Bearing (upper)
Full length provides maximum stem support. Made of 316 SS/PTFE Anti-Extrusion Ring (under stem seals)
Prevents the extrusion of stem seals, maintaining optimum seal.
Stem (blowout proof)
17-4 PH stainless steel stem with high strength, and good corrosion resistance. Designed per API 609 standard.
Jacking Taps
Allows the use of seat retainer bolts to aid in retainer removal.
Corrosion Protection
Polyamide epoxy primer with high performance polyurethane topcoat is the standard finish for carbon steel
valve bodies.