Slide Gate Valve

Slide Gate Valve

※ Flanged or BW end
※ Size Range: NPS 2 to NPS 24
※ Pressure Range: 150LB/ PN10~PN25
※ Design STD.: MSS SP-81/ ASME B16.34
※ Slide Gate Valve Manufacturer & Supplier


Slide Gate valves are linear motion valves that allow fluid to travel across the whole bore without changing direction. It is a perfect valve to transfer and block the fluid flow, and it is mostly used in the industrial process for petroleum, gas pipelines, petrochemical oil storage, and other pipelines. Parallel Slide Gate valves are named for the fact that the face of this design of the valve is usually parallel. They are primarily used to control flow and are either fully open or completely closed. Specially designed slide gate valves, on the other hand, can also be placed at the discharge of an oil pump for throttling the liquid flow.

In this post, we’ll learn more about parallel slide gate valves, including how they operate, what are their features, where they can be used, and how they differ from wedge gate valves.

What is Slide Gate Valve?

Gate valves can also be found as a parallel slide gate configuration, with the flat gates and the parallel seats. Line pressure and placement are used by parallel gate valves to create a tight seal. Flat gates are made up of two interchangeable spring-loaded discs, a guided disc carrier, and retaining pins. The springs softly press the discs against the body seats to give the first closing force. The sealing force is not provided by the springs. For better sealing and to eliminate vibration while closing, the spring forces the two discs closer to the seats. The downstream disc is held tightly against the downstream seat by the upstream pipeline pressure, which provides the sitting force.

Parallel slide gate valves provide a safety benefit in higher temperature situations due to their special design. An extra compression force on the seats of wedge-shaped gate valves can cause heat binding and limited valve opening owing to expansion. Furthermore, because parallel gates feature no wedging action, closing torques are reduced, resulting in smaller, more economical actuators or less manual work to operate the valve. Parallel gates remove dirt off the sitting surfaces since they slide into place.

Working: Slide Gate Valve.

The parallel slide gate valve is closed by rotating the hand wheel in the clockwise direction; While opening the valve requires a hand wheel to rotate in counter-clockwise direction; this also applies to gear or motor powered operation. To ensure valve sealing at the specified pressure, the valve must be closed with the required stem torque. A spring is fitted between the plates to guarantee that they always shut firmly while also allowing the plates to slide very softly while making a vertical movement. Such a design can account for the valve components’ thermal expansion and contraction, as well as the effect of varying back pressure on the seal and preventing particulate medium from penetrating the sealing surface.

parallel slide gate valve

Valve plates should self-rotate during the opening and closing operation, resulting in grinding and polishing of sealing surfaces. Additionally, because the inlet/outlet channels are not aligned with the valve body, an eddy current will be generated, which will automatically cleanse the valve cavity. All of these features contribute to the valve’s exceptional long-life performance, ensuring a reliable guarantee for your system.

Features & Benefits: Slide Gate Valve.

  • Because the parallel slide gate valve closes by sliding rather than compressing, the sealing surfaces are free of any inclination, notch, or indentation. As a result of this action, the disc on the seat-ring will be tighter, and the discs and seat sealing surfaces will last longer.
  • During the closing operation of a parallel-slide gate valve, close contact with the seats cleans the valve. As a result, any impurities that form or tend to appear on the seats and discs are removed, and the sealing contact is free of unwanted particles. It also ensures extended life by reducing seat bearing stress. Because sealing happens across the whole surface, the wide flat seating can reduce the impact of any surface damage.
  • As sealing is achieved by sliding rather than compression, no additional power or last burst of torque is necessary to make the seating leak-tight. Furthermore, as a high amount of energy is not required to open the valves, the valve functions with little energy.
  • The parallel slide gate valve’s actuator can be substantially smaller than a wedge type gate valve. On this valve, hammering or striking hand-wheels are not necessary.
  • The trim is less stressed and fatigued as a result of the low torque operating. This results in a longer lifespan and better leak-tightness.
  • The exact location of the stem does not matter when the valve is closed. As a result, variations in the coefficient of expansion of the materials are not a concern. A universal position switch could also be used to halt the actuators.
  • Body contraction can cause a jam in wedge gate valves; however, this will never happen with parallel slide gate valves.
  • The wedge must have placement guides on its slides in wedge gate valves to hold it in line while closing under full flow conditions. These guides are normally composed of soft materials, and they wear down with time, causing jamming.

Differences: Slide Gate Valve and Wedge Gate Valve.

The position seating feature of the Parallel Slide Gate Valve allows the system’s mainline force to help seal the valve seat by pressing the downstream disc tightly onto the downstream seat. A double disc wedge gate valve, on the other hand, depends on torque force to wedge the discs into the valve body to provide shutoff. In a double disc wedge gate, this necessitates the valve seat deforming to allow seating. In a short amount of time, this will lead to permanent seat deformation, causing a leak channel to establish. When compared to torque sitting, position seating requires less torque for the operation of the valve. This allows us to control the valve with a smaller actuator, lowering operator costs.

  • The sliding gate valve’s large flat seating surface provides an advantage in sealing contact areas. As a result, minor scratches or seat deformation will not become a leak path. A twin disc wedge gate valve has a relatively small sitting surface area since it depends on a line contact seating surface. With a line contact seat, a slight seat irregularity is more likely to develop a leak path. Furthermore, because this valve has a larger seating surface, bearing loads are distributed over a larger region, decreasing seat wear from normal operation.
  • A Parallel Slide Gate Valve additionally protects against a valve being thermally locked in the closed position. When a heated valve in the closed position cools, this can happen. Because the bigger valve body cools faster than the disc, the body contracts more quickly, trapping the discs between the body seats. To make the disc free from its seat, more torque will be required. However, because the seating concept of a double disc wedge gate is to wedge the disc into the body, it cannot accommodate for changing rates of contraction, and the valve might become jammed closed, needing greater force to open than is available.
  • The seating mechanism of the Parallel Slide Gate Valve makes it significantly better than the double disc wedge gate valve, with a more effective seating approach that adjusts for minor seat changes and leverages internal forces to guarantee reliable tight sealing.

Technical Specification: Slide Gate Valve.

  • Size Range :                   NPS 1/2 to NPS 36
  • Class Range :                 ASME Class 150 to Class 2500
  • Design Standard :        API 6D, ASME B16.34, ASME Section III, EN 12516, RCC-M
  • Inspection & Test :        API 598
  • Temperature Range :  -29°C to 620°C
  • End Connection:          RF / RTJ / BW
  • Operation :                     Manual Lever / Gear Operated / Pneumatic / Electrical
  • Materials :                      Carbon Steel, Alloy Steel, Stainless Steel.

Top 5 Slide Gate Valve Manufacturers

Company Name: NIBCO INC.
Type of Business: Manufacturer
Company’s Address: 1516 Middlebury Street P.O. Box 1167 Elkhart, IN 46515-1167
Contact Information: +1/574.295.3221 
Other Products: Gate, Globe, Ball, Butterfly, Chemtrol, Fire Protection Valves, etc.
Applications: Oil & gas, power, petrochemicals, chemicals, water, defence and aerospace.

Company Name: DHV Industries.
Type of Business: Manufacturer
Company’s Address: 3451 Pegasus Drive, Bakersfield, CA 93308 USA
Contact Information: Phone: 661-392-8948
Other Products: Ball Valve, Cast Steel Valve, Forged Steel Valve, Wellhead Valve, etc.
Applications: Pipeline, Refinery, Wellhead, Petrochemical, Subsea, Power Plant, Offshore, Automation, etc.

Company Name: Williams Valve Corporation
Type of Business: Manufacturer
Company’s Address: 38-52 Review Ave, Long Island City, NY 11101
Contact Information: Phone: 1.800.221.1115, 
Other Products: Gate Valve, Globe Valve, Check Valve, Emergency Shut-off Valve, Marine Valve, Pipeline Valve, etc.
Applications: Oil & Gas, Pipelines, Power Generation, Naval & Commercial Shipbuilding, Chemical Processing, Wastewater / Desalinization, Mining, and Emerging Technologies like Carbon Capture and Hydrogen Production are just a few examples.

Company Name: VAG-Gruppe
Type of Business: Manufacturer
Company’s Address: Carl-Reuther-Str. 1, 68305 Mannheim, Deutschland
Contact Information: Tel.: +49 (621) 749 0
Other Products: Butterfly, Gate, Control, Hydrant, Knife Gate, Check, Air Valves, etc.
Applications: Water treatment, seawater desalination, wastewater engineering, and dam and power plant construction.

Company Name: Ayvaz
Type of Business: Manufacturer
Company’s Address: Atatürk Sanayi Bölgesi Hadımköy Mahallesi , Mustafa İnan Caddesi No: 44 Arnavutköy – İSTANBUL
Contact Information: Phone: +90 (212) 771 01 45, 
Other Products: Isolation, Control, Safety, Balance, Diaphragm Valves, etc.
Applications: Food & Beverages, Textile, Boiler, Industries, Corrugated Cardboard, etc


The parallel slide gate valve features flat sealing surfaces between the gate and seats. As a result, the valve is best suited for usage in a straight-line fluid flow with minimal restriction. In terms of the space required between pipe flanges to accommodate the valve, these valves have a size benefit over different types of valves. Because of its simplicity of installation and lower cost when compared to other valve types designed for the same function, this valve is ideal for industrial applications such as the petrochemical sector, petroleum and gas pipelines, and so on. If you have any questions, please do not hesitate to contact us. Our experts will guide you to select the best valve for your requirement.