Gate Valves

1706 - Zetco Bronze WaterMarked Gate Valve F&F

Series 1706

Zetco Bronze WaterMarked Gate Valve F&F

Size Range: DN15 (1/2”) to DN100 (4”)
Temperature Range: -10°C to 99°C
Max. Pressure: 2000 kPa

1736 - Zetco Bronze Gate Valve F&F NPT Threads

Series 1736

Zetco Bronze Gate Valve F&F NPT Threads

Size Range: DN10 (3/8”) to DN80 (3”)
Temperature Range: -10°C to 99°C
Max. Pressure: 2000 kPa

1719 - Zetco Bronze WaterMarked PN32 Gate Valve F&F

Series 1719

Zetco Bronze WaterMarked PN32 Gate Valve F&F

Size Range: DN8 (1/4”) to DN100 (4”)
Temperature Range: -10°C to 99°C
Max. Pressure: 3200 kPa

1707 - WaterMarked Gate Valve F&F c/w Locking Mechanism

Series 1707

WaterMarked Gate Valve F&F c/w Locking Mechanism

Size Range: DN15 to DN100
Temperature Range: -46°C to 177°C for lockout device
Max. Pressure: Refer to relevant valve specification sheet

1710 - Zetco Bronze WaterMarked Gate Valve Flanged

Series 1710

Zetco Bronze WaterMarked Gate Valve Flanged

Size Range: DN15 (1/2”) to DN100 (4”)
Temperature Range: -10°C to 99°C
Max. Pressure: 1600 kPa

1712 - Zetco Bronze Outside Screw & Yoke Bolted Bonnet Gate Valve Flanged

Series 1712

Zetco Bronze Outside Screw & Yoke Bolted Bonnet Gate Valve Flanged

Size Range: 40mm to 50mm, 80mm to 250mm
Temperature Range: -10°C to 99°C
Max. Pressure: 1600 kPa

1714 - Zetco Bronze WaterMarked Gate Valve F&F c/w Brass Handwheel

Series 1714

Zetco Bronze Gate Valve F&F c/w Brass Handwheel

Size Range: DN15 (1/2") to DN100 (4")
Temperature Range: -10°C to 99°C
Max. Pressure: 2000 kPa

1715 - Zetco WaterMarked Bronze Gate Valve c/w DZR Brass T Bar

Series 1715

Zetco Bronze Gate Valve c/w DZR Brass T Bar

Size Range: DN15 (1/2”) to DN50 (2”)
Temperature Range: -10°C to 99°C
Max. Pressure: 2000 kPa

1716 - Zetco WaterMarked Bronze Tested Gate Valve c/w DZR Brass Key Cap

Series 1716

Zetco Bronze Gate Valve c/w DZR Brass Key Cap

Size Range: DN40 (1 1/2") & DN50 (2")
Temperature Range: -10°C to 99°C
Max. Pressure: 2000 kPa

1726 - Zetco Bronze Shouldered Gate Valve

Series 1726

Zetco Bronze Shouldered Gate Valve

Size Range: DN50 (2")
Temperature Range: -10°C to 99°C
Max. Pressure: 1600 kPa

1720 - Zetco WaterMarked Stainless Steel Full Bore Heavy Pattern Gate Valve

Series 1720

Zetco WaterMarked Stainless Steel Full Bore Heavy Pattern Gate Valve

Size Range: DN15 (1/2”) to DN80 (3”)
Temperature Range: -20°C to 175°C
Max. Pressure: 4000 kPa

4620 & 4621 - Zetco WaterMarked Stainless Steel Flanged Gate Valve

Series 4620 & 4621

Zetco WaterMarked Stainless Steel Flanged Gate Valve

Size Range: 25mm to 100mm
Max. Pressure at Nominal Temp.: 362 PSI @ 100°F (2500 kPa @ 37°C)

4620 & 4621 - Zetco Stainless Steel Flanged Gate Valve

Series 4620 & 4621

Zetco Stainless Steel Flanged Gate Valve

Size Range: 125mm to 200mm
Max. Pressure at Nominal Temp.: 275 PSI @ 100°F (1900 kPa @ 37°C)

Zetco Gate Valves

Gate valves are commonly used in civil and industrial piping, with a wide range of gas and fluids, where a tight seal is required in a fully closed position.

The gate valve design ensures the minimum flow obstruction and the minimum pressure drop in a fully open position, which makes them ideal for applications that require steady pressures. The operating mechanism ensures a progressive closure of the valve, which is particularly important when the flow of liquids must be blocked rapidly, without damaging the pipeline (water hammer effect). Gate valves are not suitable for the control of the flow (throttling) as the shape of the closing mechanism (wedge) induces turbulence in the flow.

Zetco Valves has an extensive range of gate valves, in a variety of configurations, produced by ISO 9001 certified manufacturers. Copper alloys like brass and bronze are used for potable water applications where the antibacterial property of copper is beneficial. Stainless steel is commonly used where the application requires high pressure, high temperature and resistance to chemical aggression from the fluid or from the environment. Aluminium bronze is also available, upon request, for marine, mining and heavy industrial applications.

The range includes gate valves with sizes from DN15 to DN200, with screwed, bolted or union bonnet and with threaded or flanged connections. Threaded connections include the international ISO 7/1 standard (BSP) and the American ANSI/ASME B1.20.1 (NPT). Flanged connections include the Australian AS 2129 Table D/E/F/H, the American ANSI/ASME B16.5 in class 150 or 300 and the European EN 1092-1 PN16 (DIN).

Zetco Valves can offer a wide range of gate valves with WaterMark certification.

Gate Valve FAQ

A gate valve is used to stop or start the flow of fluid in a pipeline by inserting or removing a rectangular gate in the path of the flow. It is operated by a threaded stem that connects a handwheel to the gate.

It is an on/off valve, designed to completely shut off flow or allow full flow in the open position. It is not normally used to regulate flow or for throttling, as a partially open gate can suffer from vibration and chatter and the gate and seat may be subjected to excessive wear. When flow needs to be regulated in a pipeline, a plug valve or globe valve should be used instead.

Gate valves are suitable for most fluids including steam, water, oil, air and gas and they are used more often with larger pipe diameters, as they are less complex to construct than other large sized valves.

They are typically used in refineries and petrochemical plants where pressures are low and temperatures high and are used less in oil and gas production because of those facilities’ high operating pressures and severe marine environmental conditions.

Different types of gate valves have different applications including:

Full-bore through conduit gate valves – have a full bore design to prevent solids from entering the body cavity and to allow cleaning and monitoring drones to pass through them.

Wedge gate valves – have a wedge-shaped instead of parallel seat that seals against both high and low fluid pressures and on both sides of the gate.

Knife gate valves - have a tapered knife-like edge on the lower surface for cutting through highly viscous slurries such as paper pulp.

Rising stem gate valves – popular because the position of the valve (open or closed) can be noted just by looking at the position of the stem (preferred in applications where monitoring must be done from a distance or when the line cannot be shut down to test it).
Gate valves and ball valves are both used to control the flow of liquids and gases. The main difference is in how they open and close the valve, with a gate valve moving a gate up and down and a ball valve rotating a ball 90 degrees.

The gate valve is operated by a threaded stem connected to a handwheel and requires several turns to open or close the valve. The ball valve’s stem is attached to a handle, which when turned 90 degrees, rotates the ball to open or close the valve. This difference gives each certain advantages and disadvantages, making both more suited to certain applications:

  • Because a ball valve handle only requires a 90 degree turn, it is more suitable for applications where emergency shut off is a desirable feature.

  • Fast shut off can also cause water hammer, so the gate valve’s slower closing speed is preferable in situations where damage to a delicate system needs to be avoided.

  • The position of a ball valve’s handle indicates whether the valve is open or closed, while it’s much harder to tell with a gate valve handwheel. This makes ball valves better for applications where monitoring from a distance is required.

  • The ball valve’s handle requires more room to operate than a handwheel, making a gate valve preferable in tight installation applications.

Other differences include:

Cost - ball valves are more expensive

Sealing - gate valves are more prone to leaks

Flow capacity - gate valves can provide larger flow capacity

Design – ball valves are harder to clean, making gate valves preferable for applications involving slurries and viscous media

Pressure – gate valves are better for high pressure applications

Durability - ball valves are more durable and require less maintenance than gate valves.
Gate valves are not suitable for variable flow control or throttling as the seating is perpendicular or at right angles to the direction of flow. Repeated movement of the wedge (gate) near the point of closure under high velocity flow, may create a drag on the seating surfaces and causing galling or scoring on the down stream side. A slightly opened edge may cause turbulent flow with vibration and chattering of the wedge.
The gate valve may be used in domestic and commercial plumbing applications. It works by turning a handwheel which raises or lowers an internal wedge shaped gate to start or stop the flow of water through a pipeline.

Gate valves are purely on/off valves and should never be used to regulate or throttle the flow of water. That’s because a gate that is partially opened or closed can be subjected to vibrations and wear damage.

In plumbing, gate valves are commonly used as shutoff valves on main and branch water supply lines, where the water only needs to be shut off infrequently. This is because if they are used too frequently, their parts can become corroded and they can get stuck in an open or closed position.

While ball valves are gradually becoming more popular in plumbing, gate valves still offer a number of benefits including:

Slow opening and closing – the handwheel takes several turns to open or close the gate, which reduces the likelihood of damaging water hammer (shock waves) from occurring if the valve is closed too quickly.

Minimal flow resistance – because the gate retracts entirely into the body of the valve, this allows for maximum flow capacity.

Less expensive price – gate valves are less expensive than ball valves, which last longer but are initially more expensive to buy.

Large capacity – due to their simple design, gate valves are easier to manufacturer in larger sizes and pipe capacities, making them more suited to large water management systems.

Easy installation – because a handwheel takes up less room than a ball valve’s operating handle, a gate valve can be installed in much tighter spaces.

Easy cleaning – gate valves are easier to clean than ball valves, making them a better choice for use with slurries and viscous fluids.
A gate valve opens by lifting a gate out of the path of the fluid in a pipeline and closes by replacing the gate in its path. The face of the gate can either be parallel or more commonly, wedge-shaped, which applies more pressure to the seal at the bottom.

Gate valves are typically used as shut-off valves, fully blocking or unblocking the flow rather than regulating it. This is because a partially open gate can be subjected to vibrations and wear damage.

The gate is operated by a threaded stem connected externally to a handwheel. This will either be a rising or non-rising stem, depending on which end is threaded.

A rising stem is attached to the gate and they rise and lower together as the valve is operated. The rising stem shows at a glance the position of the valve, making it useful for applications where inspection from a distance is necessary.

A non-rising stem is attached to and rotates with the handwheel and because the gate's motion is concealed inside the valve, it is harder to tell the position of the gate. However, non-rising stem valves are useful when installation space is limited.

When fully open, the gate slides up into the body of the valve (the bonnet), so there is no obstruction in the flow path and very little flow resistance.

Gate valves can have either a screw-in, union, or bolted bonnet. The screw-in bonnet provides a durable, pressure-tight seal, while a union bonnet is best in applications where frequent inspection and cleaning is required. And a bolted bonnet is designed for larger valves and for higher pressure applications.

Gate valves are typically made from cast iron or steel and they are more often used with larger pipe diameters as they are easier to construct in large sizes than other types of valves.