Gate Valves

The gate valve is the most widely used type of valve in various industries. It features a gate-like disk that moves perpendicular to the flow direction, either opening or closing the flow. Gate valves are primarily used as stop valves, providing full-bore, straight-through flow when fully open, with minimal pressure loss. They are suitable for applications where the valve remains fully open or fully closed and not for modulation or throttling.

Key Features

Key features and benefits of Gate Valves
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Key Features

A key feature of a gate valve is its ability to provide a tight and reliable shut-off when fully closed. Gate valves are designed to create a seal by positioning a gate or wedge perpendicular to the flow direction, effectively blocking the passage of fluid. This feature makes gate valves particularly suitable for applications where preventing leakage and ensuring a secure shut-off is critical.
2

Key Features

Soft sealing is a recent development in which plastic or synthetic rubber rings are inserted into the faces of the disk or body seat rings to provide soft sealing backed up by contact of the metal to metal faces. Soft seals pro­vide improved sealing characteristics over a very useful range of temperatures for a great variety of fluids.
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Key Features

The wedge type disk can also be obtained in a flexible design, developed primarily to overcome sticking on high-temperature services subject to great temperature changes. In one form the single piece construction of the disk is maintained but the two seating faces are separate from each other except for a short connecting axle or spud at the centre of the disk.

Agricultural Gate Valves

Agricultural gate valves, available in sizes from 4" to 8", feature brass bodies and come in three types: Standard Tanker, Tanker with Hydraulic Jack, and Lever Gate Valve. Designed for farming applications, these valves offer pressure ratings from 1.5 to 4 Bar. They include AGRI standard square flanged x threaded BSP and square flanged end connections, ensuring reliable operation in agricultural settings.

Size Range: 4" to 8"
Body Materials: Brass
Body Type: Standard Tanker Gate Valve, Tanker Gate Valve with Hydraulic Jack, Lever Gate Valve
Applications: Farming, Agricultural
Pressure Ratings: 1.5 Bar - 4 Bar
End Connections: AGRI Standard Square Flanged x Threaded BSP, AGRI Standard Square Flanged
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Brass Gate Valves

Brass gate valves, available in sizes from 1/4" to 4", are ideal for a variety of applications including potable and waste water, cooling systems, as well as oil, gases, and air handling. These valves, made from high-quality brass, feature a standard gate valve body style and offer pressure ratings of PN20 and CL150. They come with screwed NPT or BSPT end connections, ensuring reliable and effective performance across multiple uses.

Size Range: 1/4" to 4"
Body Materials: Brass
Body Style: Standard Gate Valve
Applications: Potable/Waste Water, Cooling Systems, Oil, Gases, Air
Pressure Rating: PN20, CL150
End Connections: Screwed NPT, Screwed BSPT
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Bronze Gate Valves

Bronze gate valves play a crucial role in plumbing and fluid control systems, celebrated for their dependability and long-lasting performance. Typically crafted from bronze, a copper-based alloy, these valves employ a gate mechanism that can be maneuvered up or down to manage fluid flow within pipes. Thanks to bronze's natural resistance to corrosion, these gate valves excel in water systems and various low-pressure conditions. They are often available in flanged or threaded configurations, simplifying installation and maintenance.

Size Range: 1/4" to 6"
Body Materials: Bronze, Brass
Body Types: Lever Gate Valve, Standard Gate Valve
Applications: Potable/Waste Water, Cooling Systems, Oil, Gases, Air
Pressure Rating: PN20, PN16
End Connections: Screwed BSPP
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Carbon Steel Gate Valves

Carbon Steel Gate Valves, available in sizes from 1/2" to 72", are made from either cast or forged carbon steel. They meet stringent design standards such as API 600, API 603, ANSI B16.34, API 602, and BS 5352, ensuring reliable performance across various applications including water, gas, air, and waste management. These valves are tested according to API 598 and BS 6755 PT1 for quality assurance and offer versatile end connections like flanged, screwed, and welded, catering to diverse installation needs.

Size Range: 1/2" - 72"
Body Materials: Cast / Forged Carbon Steel
Design Standards: API 600, API 603, ANSI B16.34, API 602, BS 5352
Applications: Water, Gas, Air, Drinking Water, Waste Water (See Chart For More)
Testing: API 598 & BS 6755 PT1
End Connections: Flanged, Screwed, & Welded
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Cast Iron Gate Valves

Cast Iron Gate Valves, constructed from high-quality cast iron, are essential components for controlling the flow of fluids in various applications. These valves are known for their robustness and durability, making them ideal for both high and low-pressure systems. Featuring a wedge-shaped gate that provides a tight seal, they offer precise control of fluid flow, minimising leaks and ensuring efficient operation. With a reputation for reliability and resilience, Cast Iron Gate Valves are a popular choice across industrial, plumbing, and construction sectors, offering a dependable solution for fluid control needs.

Size Range: 1 1/2" to 12"
Temperature Range: -10°C to 120°C
Pressure Rating: PN16
End Connection: Flanged PN16
Body Materials: Cast Iron Body, Cast Brass Seat
Body Types: Stainless Steel Stem, Inside Screw, Non-rising Stem
Applications: Potable/Waste Water, Cooling Systems, Oil, Gases, Air
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Ductile Iron Gate Valves

Ductile Iron Gate Valves, known for their robust construction and dependable performance, are a vital component in any plumbing or industrial system. Crafted from high-quality ductile iron, these valves offer exceptional strength and resistance to corrosion, ensuring longevity even in harsh conditions. Their precise control and leak-free operation make them a preferred choice for controlling the flow of liquids and gases. With various sizes available, these gate valves are suitable for a wide range of applications, and their ability to withstand high pressures and extreme temperatures adds to their versatility. Whether in plumbing, industrial, or construction settings, Ductile Iron Gate Valves stand as a reliable solution for fluid control and are designed to meet the highest industry standards.

Size Range: 2" to 12"
Temperature Range: -20°C to 230°C
Pressure Ratings: PN16, 7 Bar, 12.8 Bar
End Connections: Flanged PN16, Flanged BS10 Table E, Flanged BS10 Table D, Flanged BS EN 1092-2 PN16,
Body Materials: Epoxy Coated Ductile Iron Body, Ductile Iron Epoxy Coated Body, Cast Iron Body
Applications: Potable/Waste Water, Cooling Systems, Oil, Gases, Air
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Stainless Steel Gate Valves

Explore our range of stainless steel gate valves, available in sizes from 1/2" to 72". These valves are constructed from high-quality cast or forged stainless steel and comply with top industry standards including API 600, API 603, ANSI B16.34, API 602, and BS 5352. Suitable for a variety of applications such as water, gas, air, and waste management, they are rigorously tested to API 598 and BS 6755 PT1. Options for end connections include RF, RTJ, butt weld, screwed, and welded.

Size Range: 1/2" - 72"
Body Materials: Cast / Forged Stainless Steel
Design Standards: API 600, API 603, ANSI B16.34, API 602, & BS 5352
Applications: Water, Gas, Air, Drinking Water, Waste Water (See Chart For More)
Testing: API 598, & BS 6755 PT1
End Connections: RF, RTJ, Butt Weld, Screwed, & Welded
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Wras Approved Gate Valves

The Wras Approved Gate Valve consists of a GJS 400-15 Ductile Iron body in compliance with EN1074 to ensure the highest standard of efficiency throughout the product life. Valve wedges are constructed in Ductile Iron with a vulcanised, durable rubber coating capable of operation in temperatures up to 120°C. Sealing areas of the body reman flat offering an unrestricted flow path and ensure a 100% leak tightness.

Size Range: DN32-DN1600 (1 1/4"-64")
Body Materials: GJS500-7 Ductile Iron Rilsan Coated
Disc Materials: CF8M Stainless Steel
Seat Materials: EPDM, NBR Buna, Hypalon, Viton, Silicone, High Temperature, Polyisoprene, Epichloridine
Actuated Function: Lever Operated, Hand Wheel / Gear Box Operated, Extended / Extension Chain Wheel
Applications: Potable/Waste Water, Cooling Systems, Oil, Gases, Air
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Flexible Wedge Disk

The wedge type disk can also be obtained in a flexible design, developed primarily to overcome sticking on high-temperature services subject to great temperature changes. In one form the single piece construction of the disk is maintained but the two seating faces are separate from each other except for a short connecting axle or spud at the centre of the disk. In this way, each disk face is permitted a certain degree of independent movement which, besides eliminating the possibility of sticking in the closed position, facilitates tightness on both the upstream and downstream sides of the disk over a wide range of pressures and temperatures.

Stem Arrangement

Gate valve designs include Inside Screw (rising and non-rising stem) and Outside Screw (rising stem). The Inside Screw with a rising stem is cost-effective and common in smaller sizes, with the stem position indicating the disk's status. However, these are unsuitable for corrosive fluids or high temperatures as internal threads may bind. The Inside Screw with a non-rising stem is ideal for limited space, reducing wear by eliminating vertical stem movement. The Outside Screw design features external threads, protected from fluid effects and allowing easy lubrication, suitable for environments with adequate headroom.

Soft Sealing

Soft sealing in valves incorporates plastic or synthetic rubber rings to enhance sealing capabilities, improving fluid control across a wide temperature range and with various fluids. These resilient seals effectively recover from deformation caused by dirt and solid particles, reducing operational effort. Soft seals in block and bleed applications ensure tight closure with a single valve, potentially replacing two conventional valves. Notably, wedge gate valves feature synthetic rubber bonded to the disk, offering robust shut-off and resilience, with sealing achieved through both axial wedge action and radial contact.

Frequently Asked Questions

A gate valve is a type of valve used to control the flow of fluids (liquid or gas) within a pipeline or system. It is primarily designed to either fully open or fully close the flow, and it is not typically used for regulating the rate of flow like a globe valve or a ball valve.

One advantage of a gate valve is its ability to provide a tight seal, making it ideal for applications where a complete shut-off of fluid flow is required. When fully closed, the gate valve creates a secure and leak-proof seal, preventing the passage of fluids in either direction.

To open a gate valve, you typically turn the valve handle or operating mechanism in a counterclockwise direction (to the left). This action raises the internal gate or wedge to create an unobstructed pathway for fluid flow. Conversely, turning the handle in a clockwise direction (to the right) closes the valve by lowering the gate, obstructing the flow and sealing the passage.

The most commonly used type of gate valve is the "wedge gate valve." Wedge gate valves are widely employed in various industries due to their robust design, reliable performance, and the ability to provide a tight seal. They have a solid, flat gate or wedge-shaped disc that moves perpendicular to the flow direction to either fully open or fully close the valve.

Gate valves, when fully open, do not inherently reduce pressure. However, they can introduce some pressure drop due to the flow obstruction created by the gate or wedge. The extent of pressure drop or flow restriction depends on the design of the gate valve, including factors like the shape of the gate and the clearance around it.

Yes, gate valves can restrict flow, particularly when they are partially open. Gate valves are primarily designed as on/off valves, but they can be used to control flow to some extent. When a gate valve is partially closed, the gate or wedge inside the valve partially obstructs the flow path, creating a restriction in the pipeline. The extent of flow restriction depends on how far the gate is lowered into the flow path.

There are several alternatives to gate valves, each with its own characteristics and advantages. The choice of an alternative valve depends on the specific requirements of the application. At Actuation Valve we offer ranges of Ball Valves, Globe Valves, Butterfly Valves, & Check Valves, e.g.

To install a gate valve effectively, begin by preparing a clean work area and choosing the right valve for the application. Inspect the valve for defects and ensure the flange faces are clean and aligned properly. Secure the valve in place by bolting it to the flanges using the correct torque specifications, following a crisscross pattern. Conduct a pressure test if necessary and check for smooth valve operation. Proper alignment of the connected piping is essential.

Gate valves are not typically used for regulating water pressure. Their primary function is to provide on/off control of fluid flow. While you can partially close a gate valve to reduce the flow of water, it is not an effective or precise means of regulating water pressure. If you need to regulate water pressure in a plumbing system, it's better to use pressure-reducing valves or pressure control valves specifically designed for that purpose.

Yes, Actuation Valve offers sustainable spares and replacement parts for ongoing maintenance schedules.

To stop a gate valve from leaking, first identify the source of the leak, which could be around the valve stem, packing gland, or gate. If the leak is at the stem, try tightening the packing gland nut using a wrench, but avoid over-tightening. If the issue persists, inspect the valve stem for damage and replace it if necessary. Additionally, consider replacing the packing material, which may require removing the old material and installing new packing. Ensure that there are no obstructions or debris on the gate or valve seat.

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Gate Valves

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