Full Bore: The outstanding feature of the parallel slide design is that of maintaining fluid-tightness without the aid of wedging action. No mechanical stress is exerted between the discs, and there are no problems associated with cool-down of the fluid.
The Venturi design is used when a slightly higher pressure drop is acceptable. The well established principle of fluid flow through a Venturi is used in order to minimise pressure drop. Venturi valves incorporate the design feature of an eye follower. In the fully open position the eye follower bridges the gap between the seats thus giving a smooth flow path and completing the Venturi profile.
Fluid tightness achieved by fluid pressure – not from mechanical wedging action thus eliminating thermal binding, Complete flow isolation in either direction, Minimum pressure drop Freedom from leakage independent of temperature or pressure changes, Self-aligning fully supported discs, Inherent self-cleaning action, In-line maintenance, Valves can be offered to incorporate features such as quick closure, live loaded gland, double stuffing box with lantern ring and bleed-off point, back seat, seal welded body/cover joint
General purpose stop valve, Main steam and feedwater isolation, Boiler circulating pump isolation, The basic design is also incorporated in valves for other duties such as: Feedwater heater protection; Feed pump leak-off; Nuclear Applications (ASME Section III, Class 1, 2 & 3) (Described in other publications available on request); Regulating duty with V-ported seat
ASME B16.34 Alternatively, valves can be supplied to other national standards, ASME section IIIRCC-M
ASME Class 150 to 4500
15 to 1200 mm (1/2″” to 48″”)
29C to 620C (-20F to 1150F)
Carbon Steel, Alloy Steel, Stainless Steel, Bronze
