The shaft is of one piece construction with an anti-blowout feature on the non-drive side and a reduced diameter at the actuator end. If failure of the shaft -to -disc connection, or internal failure of the shaft occurs due to excessive torque, no portion of the shaft can be ejected from the valve as result of internal pressure.
T-Series Resilient Seated Valve
This single piece construction also provides a rigid assembly when pinned to the disc via means of shaft pins (peened over and locked). This prevents excessive disc deflections, which maintains a constant disc/seal contact stress ensuring a bi-directional sealing valve at both low and high pressures. The valve has a double offset design providing a camming action. This eliminates excessive wear between the seat and disc-sealing interface both during the opening and closing strokes extending the sealing life of the valve.
Maintenance of the valve is quick and relatively simple. The PTFE insert, seat gasket and secondary seat can be replaced by simply unbolting the retaining ring and assembling the new parts without removing any other parts. Gland packing is simply adjusted by tightening gland nuts, which are easily accessible between the mounting legs without having to remove the adapter plate or actuator.
|FEATURES AND BENEFITS
|Certified Firesafe to BS EN ISO 10497 and
BS 6755 Part 2
|Tight shut-off in both directions to API 598
|Field replaceable PTFE insert and secondary metal seat
|Ansi 150#, 300#. PN 6, PN 10, PN 16, PN 25
Others On Request
|Double Offset giving low Unseating and Seating Torques
|Anti blow-out device to API 609
|Carbon Steel (ASTM A216 WCB)
Stainless Steel (ASTM A351 CF8M)
Duplex & Super Duplex stainless steels
6Mo stainless steel
A Non-Firesafe and Firesafe High Performance Butterfly Valve. Double Offset Design Sizes 3" – 48". ANSI 150# and 300# rating. The shaft is of one piece construction with an anti-blowout feature on the drive side and a reduced diameter at the actuator end. If failure of the shaft -to- disc connection, or internal failure of the shaft occurs due to excessive torque, no portion of the shaft can be ejected from the valve as result of internal pressure.
Valves can be supplied with manual, electric, pneumatic or hydraulic actuators. Fail-safe systems for emergency operation are also available.
The PTFE insert is rigidly held into the body and ‘energized’ onto the spherically machined disc by means of the secondary seat which is fixed into the body by a bolted in retaining ring. This version is used in low temperature and ambient applications.
The PTFE insert is rigidly held in the body and ‘energized’ onto the spherically machined disc by means of the secondary seat which extends onto the disc periphery and is fixed into the body by a bolted in retaining seat. When the PTFE insert is burnt away, during a fire, the secondary metal seat is designed to ‘energize’ onto the disc and form a seal in both directions.