Sempell Dewrance High Pressure Parallel Slide Gate Valve

The Sempell Dewrance High Pressure Parallel Slide Gate Valve is a premium, heavy-duty isolation valve engineered for the rigorous demands of high-pressure and high-temperature applications. Developed with Sempell’s long-standing expertise in critical service valve design, this valve provides exceptional sealing performance, long service life, and reliable shutoff in the most severe operating environments. Featuring a parallel slide gate design, the valve eliminates wedging forces common in wedge gate valves, ensuring smoother operation, reduced actuation torque, and minimal seat wear. This design also delivers superior thermal cycling capability, making it ideal for power plant applications, especially in superheated steam, feedwater, and boiler isolation systems. Its robust construction, precision-machined seating surfaces, and the use of high-alloy materials ensure safety, durability, and continuous performance even during rapid pressure and temperature fluctuations. With full compliance to major international standards, the Sempell Dewrance valve is trusted in power generation, petrochemical, refinery, and industrial steam systems across the globe.

Technical Specification of Sempell Dewrance High Pressure Parallel Slide Gate Valve

Certifications

ASME B31.1, India Boiler Registration, PED

End Connection

Butt Weld

Application

Steam turbine, Steam Headers, Pumps, Valves & Manifolds, High Temp, HRSG, Boiler, Balance of Plant, Boilers, Conventional, Cogeneration

Body Design

Top Entry, Long Pattern

Material

Alloy, Carbon Steel, Steel

Operating Temperature

High Temperature

Pressure Class

ASME

Process Connection Type

BWE

Seat/Seal Type

Metal-to-Metal, Parallel Slide

Shutoff Class

Class V (FCI 70-2)

Standards

ASME B16.34

Style

Direct-Operated

Valve Size

5 inch, 6 inch (DN150) and Larger

Valve Size Standard

NPS

Valve Type

Gate, Engineered Product

Feature of Sempell Dewrance High Pressure Parallel Slide Gate Valve

• Excellent reliability
  • Eyelet follower providing a smooth flow path and maximum performance
  • Self cleaning action between disk and seat
  • Welded-in seats hard-faced with Stellite® or equivalent
  • Seat surface protection provi
  • Improved performance
  • Lower pressure drop characteristic than wedge gate valve
  • Reduced actuator size/cost by 30% when compared to wedge gate
  • Improved sealing assisted by line pressure
  • Low operating torque
  • seals on position not torque