What is the purpose of a gate check valve?

A gate valve is a device used to stop and start the flow of liquid and isolate sections of a water supply as required. Sometimes referred to as a sluice valve, there are many different types of gate valves suitable for various applications in utility distribution, industrial and HVAC pipeline settings. Let's take a look at what a gate valve is used for, the differences between the most common types, and the things to consider when specifying a gate valve.

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WHAT IS A GATE VALVE?

A gate valve is a type of linear valve used to isolate areas of a water supply. As the name suggests, it acts like a gate that shuts off the flow and opens it again when needed.

Gate valves work via a gate or wedge that lifts (opens) or lowers (closes) into the path of the flowing liquid. Motion is produced by an actuator that is connected to the stem of the gate, which may be manual, electrically, pneumatically or hydraulically powered. They may have a rising stem, meaning it is fixed to the gate, or a non-rising stem, where it is fixed to the actuator and remains within the valve body. The latter is most commonly used in the waterworks industry and is suitable for underground applications where there is limited vertical space. 

Gate valves may also sometimes be referred to as stop valves, line valves, wedge gate valves and sluice valves, but they are not to be confused with sluice gates or penstocks. These are altogether larger devices used to severe the flow of sewage and water in treatment plants and drainage systems, etc.

WHAT IS A GATE VALVE USED FOR?

A gate valve is commonly used for isolation duties within potable water, wastewater, sewage and fire main applications. They may be used during maintenance tasks and repair works, as well as being deployed in new installations.

There are many different types of gate valves to suit different applications. Some of the most common designs include wedge gate valves, parallel gate valves, knife gate valves, and rising/non-rising stem gate valves. Generally speaking, you can classify gate valves in three different ways:

• According to the disk type - e.g. taper wedge vs flexible vs split/parallel disk gate valves
• According to stem movement - rising stem vs non-rising stem gate valves
• According to bonnet joint - screwed vs bolted vs welded

The best type to deploy will very much depend on what the gate valve is used for. For example, metal seat valves use a non-ferrous metal face, making them ideally suited to wastewater and sewage applications. When isolating water and clean neutral fluids, resilient seated gate valves provide the ideal solution and work using a rubber encapsulated wedge. Meanwhile, knife gate valves are ideal for handling dense fluids and dry bulk solids. Most gate valves deployed in the waterworks industry have non-rising stems, also referred to as inside screw, meaning the stem remains within the body of the valve.

T-T Flow offers a wide variety of gate valves designed to British and European Standard, with many different options to suit differing applications.

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Did you know that check valves are crucial for every water system? You may not think about them much, but they are in everything from simple house sprinklers to complex municipal water pipes.

There are several types of valves, in addition to a check valve. Each one serves a distinct purpose. One of the first things you learn when you start working with plumbing or in other industries using valves, is that different names and terms mean different things.

So, what are the differences between valves? This article will explain what makes a gate, globe, and check valve different, their uses, and where you will often find them. So, read on as we explain how to determine which valve is best for your needs.

What Is a Gate Valve?

The linear valves of the shutdown valve family include gate valves. The gate valve, recognized by its wedge-shaped disc, is often used to isolate media.

Applications requiring a tight seal can use this kind of valve. In thicker mediums with more viscosity, a unique type of gate valve called a knife gate valve is often used.

Gate valves produce minimal pressure drops since there are no obstructions in the path of the media. The gate opens the valve by sliding the gate disc upward.

The disc lowers to touch the seats when it closes. The gate valve's disc might have a knife or wedge shape.

Gate valves do not control the flow of media, although they have considerable throttling capacity. Due to the thinness of its disc, it might get misaligned from its seat due to media vibration.

Because of this, the life of a gate valve may shorten and suffer degradation with this condition. The gate valve should open or close fully when in operation to increase the valve's lifespan.

What Is a Globe Valve?

The globe valve is part of the linear motion valve grouping. Its functions include controlling the flow of media as well as halting and starting it. The globe valve offers a tight seal with less opportunity of leaking due to its design.

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The globe valve has a fitting name. It gets its name because of its common body form. Modern globe valves, however, may adapt to different body shapes.

A disc that resembles a plug is what regulates the flow of media. Since the gate valve has seats running parallel to the media flow, there is less seat deterioration when the valve is operating.

As a result, the globe valve is a fantastic throttling valve. Its design can result in a high-pressure drop, which is a drawback.

Globe valves are excellent options for applications where leakage and safety are the primary concerns. These valves often have a top-entry construction, which allows access to the interior valve parts from the top. They also ensure flow regulation.

How Do They Work?

The disc in the gate valve working mechanism will lodge between the seats of the valve. In terms of the media flow, its motion is at the right angle.

It offers either a complete flow or none at all. The flow space is equal to the valve cavity's size when the valve is open, plus a small amount where you find the seats and stem.

On the other hand, the globe valve disc moves along the media flow. The disc just needs to move a little bit from its place when there is a free flow. The design of the globe valve allows throttling and provides a tight cutoff.

What Is a Check Valve?

A check valve, often known as a one-way valve, is a component that only permits one direction for fluid passage. A check valve's main objective is to keep backflow from occurring in the system. Check valves are simple, cost-efficient, and quick fixes for possible problems.

If the flow gets contaminated and contaminates the media upstream, backflow may result. For instance, a non-return valve installed in a sewer pipe ensures that waste can exit but cannot return to the system from where it originated.

You can find a check valve for whatever application you need. This is due to the variety of designs, sizes, and materials available to you. The use of two-way check valves is common.

Three-way check valves prevent backflow from contaminating the incoming water supply. An existing drain can receive purged water thanks to the atmospheric vent. There is an arrow on the valve's bonnet where you can check the direction of the check valve's flow.

Check Valve Uses 

You will find check valves in almost every industry. They are fitted to typical home appliances like washing machines, dishwashers, and sewer lines. You will find them on furnaces, boilers, pumping applications, and gas or vacuum systems for industrial applications.

On water and CO2 lines, they are common and used for aquarium check valves. Also, a tiny check valve is a common option when space is at a premium yet dependable operation is still required.

Water and air applications are two of the most typical uses for check valves. Here are a few more examples of their common applications:

• To protect downstream equipment from damage by backflow
• To stop contamination brought on by a reverse flow
• To keep siphoning from happening
• To ensure a vacuum seal

Check Valves for Water

Check valves, also known as one-way water valves, are commonplace for drinking and wastewater applications. They make sure that no environmental media from the outlet side of the valve can enter the system, keeping dangerous contaminants out of our drinking water.

A foot valve is often used in water-pumping applications to prevent debris from entering the line and to maintain the internal pressure used for priming. Duckbill valves can also be utilized for water line discharges. For sump pumps, a check valve ensures that when the pump is switched off, the water that has been discharged won't return by gravity to the sump pump.

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