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Full Bore or Venturi Parallel Slide Gate

Hopkinsons®

Full Bore & Venturi Parallel Slide Gate

We recommend Hopkinsons® Full Bore & Venturi valves when a gate valve is required for steam or feedwater duty in medium and high pressure ranges.

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.

VENTURI DESIGN

  • 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.

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

  • 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

APPLICATIONS

  • 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

DESIGN STANDARDS

  • ASME B16.34.

  • Alternatively, valves can be supplied to other national standards.

  • ASME section IIIRCC-M

DESIGN RATINGS

  • ASME Class 150 to 4500

SIZE RANGE & DIMENSIONS

  • 15 – 1200 mm (0.5 – 48 inches)

TEMPERATURE RANGE

  • 29°C – 620°C (-20°F – 1150°F)

MATERIALS

  • Carbon Steel

  • Alloy Steel

  • Stainless Steel

  • Bronze

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