• HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE right angled view
  • HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE top view
  • HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE right side view
  • HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE front horizontal view
  • HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE left side view
  • HOPKINSONS® FULL BORE & VENTURI PARALLEL SLIDE GATE horizontal back view

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.

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.

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.

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 RATINGS

  • ASME Class 150 to 4500

MATERIALS

  • Carbon Steel
  • Alloy Steel
  • Stainless Steel
  • Bronze

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

DESIGN STANDARDS

  • ASME B16.34.
  • Alternatively, valves can be supplied to other national standards, ASME section IIIRCC-M

SIZE RANGE & DIMENSIONS

  • 15 – 1200 mm (0.5 – 48 inches)

TEMPERATURE RANGE

  • 29°C – 620°C (-20°F – 1150°F)

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