We recommend Hopkinsons® Full Bore & Venturi valves when a gate valve is required for steam or feedwater duty in medium and high pressure ranges.
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.
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 Class 150 to 4500
KEY FEATURES & BENEFITS
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
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
Alternatively, valves can be supplied to other national standards, ASME section IIIRCC-M
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