T-Series - PTFE Sealed Firesafe Valve

Product Brand: Solent & Pratt

PTFE Sealed Firesafe Valve


  • Firesafe and non-Firesafe: Certified Firesafe to BS 6755 part 2 and BS EN ISO 10497.
  • Sizes: 3” (80mm) to 48” (1200mm)
  • Body styles: Double Flanged, Wafer Lugged, Wafer Flangeless
  • Geometry: Double offset giving low unseating and seating torques electroless nickel plated spherical blade periphery is an option.
  • Pressure ratings: ANSI 150#, 300#. PN 10, PN 16, PN 25. Others on request

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.

Specifications

Description

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.

Operators

Valves can be supplied with manual, electric, pneumatic or hydraulic actuators. Fail-safe systems for emergency operation are also available.

Theory of Operations

Standard Design

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.

Firesafe Design

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.

Features and benefits
Feature Description
Certification Certified Firesafe to BS EN ISO 10497 and
BS 6755 Part 2
Operation Tight shut-off in both directions to API 598
Maintenance Field replaceable PTFE insert and secondary metal seat
Pressure Rating Ansi 150#, 300#. PN 6, PN 10, PN 16, PN 25
Others On Request
Geometry Double Offset giving low Unseating and Seating Torques
Safety Feature Anti blow-out device to API 609
Body Designs Double Flanged
Water Lugged
Water Flangeless
Flange Designs ANSI
API
MSS
BS
PN
ISO
DIN
Actuation Manual gearbox
Pneumatic
Electric
Hydraulic
Materials Carbon Steel (ASTM A216 WCB)
Stainless Steel (ASTM A351 CF8M)
Duplex & Super Duplex stainless steels
6Mo stainless steel
Aluminum Bronze
Monel
Incoloy
Inconel
Hastelloy B&C
Titanium
T-Series - PTFE Sealed Firesafe Valve
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