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Parallel Slide Gate Valve (PSG)

Parallel Slide Design

The gate is a split design using two discs spring loaded and held together by a gate holder with an spring to provide initial energizing when closed. The gate relies for seat tightness on the primary fluid pressure acting on the downstream half. There is no wedging action or extra loading on the seats resulting in considerably lower operating torque.

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When the valve is in the open position the gate is completely clear of the seats. During closing there is a bevel on the bottom of the gate to guide it in between the seats and recompress the spring. Seating surfaces are hard faced with Stellite#6 to provide high cycle capability in very high differential pressure. Valve shut-off tightness: ANSI B16.104 Class V or Class VI optional.

Pressure Seal structure for valves≥4″are intended for high pressure, high temperature applications in all types of fluid except where severe coking is a factor. The design and material selections provide excellent service in steam-generation stations, industrial chemical plants and thermal power plants. Pressure Seal valves are offered in Cast Steel and Forged Steel body designs.

Parts and Materials

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Main features of parallel slide gate valve:

  • • Available in sizes from 2" to 24" diameter
  • • Pressure Seal Valves are manufactured in strict accordance with the following standards: ASME B16.34 •ASME B16.10 •ASME B16.25 •API 598, API598/MSS-SP-41, MSS-SP-25
  • • Precision machined gate for superior seating capability
  • • Special design should be considered for applications outside of these conditions Non-clogging full port design for smooth flow
  • • Easy conversion from hand-wheel to cylinder, bevel gear or electric motor operator.
  • • The stem also has a back seat shoulder to match with the back seat ring in the bonnet
  • • Factory installed V-port seat insert available

General Use PSG Valve Production Range

Dimensional Data (In.) and Weights (Lbs.)

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PSG Valve with Venturi design and eye follower

Apart from the above features, for size ≥4”, 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 minimize 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:

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parallel_slid_valve

parallel_slid_valve



parallel_slid_valve



parallel_slid_valve

Features:

  • • Spring or spring to hold disc against seat for initial sealing
  • • Hard face Stellite or equivalent discs and seats
  • • Follow eye eliminates the fluid swirling disturb through the seat
  • • Specially designed stuffing box to suit expanded graphite packing
  • • Expanded graphite pressure seal ring
  • • Seal tightness: ANSI B16.104 Class V, VI optional
Technical Specifications Download