Learn About Types Of Water Valves and Their Uses

Valves have all sorts of applications, and are vital to a number of industries. But let’s concentrate on water valves, and start with a brief overview and explanation of different types of water valves. In the simplest terms, a valve is a mechanical device designed to block a pipe either completely or partially to change the amount of gas or fluids that flows through that pipe. A valve that controls water is commonly used in a faucet for a kitchen, bathroom, and in service lines to control the amount of water that flows into your home. But a water valve can also control waste water flow, extremely hot water, or steam.

A good example of yet another type of valve is a gas valve. Multiple gas valves are located on your cook-top, in which a valve controls gas flow through the pipe to each individual burner. With more gas, you get a bigger flame and more heat. Naturally there are multiple gas valves located in your home that control heat and hot water.

types of water valves

Fire sprinkler system main control valve

The History of Water Valves

The Roman Empire was one of the first civilizations to make use of water valves. The design of the ancient Roman water valve was very similar to that of modern valve we still use today. In general, the ancient model used a bronze cylindrical insert inside a valve body. The cylinder has two oval holes to allow passage of water. Sometimes a pin was forced into the valve with a hammer; it could be turned but not removed to prevent people from tampering with the water supply, or use water without proper authorization. In a modern design, a plug insert was rotated or moved within valve body to provide flow or shutoff. In most cases we refer to this as the gate, or ball, component of the valve. Types of water valves vary with how they operate, and their components.

Types of Water Valves

Water valves comes in a variety of designs, with some specialized functions as well. From the outside, most types of valves probably look the same, but the blocking mechanism can be quite different. Some of the most common types of domestic water valves are as follows:
types of water valves

Some valves are specifically designed to automatically open to release the gas or water pressure inside of it; these are called safety valves, or pressure relief valves. When the valve contains dangerous liquids or gas, including toxic chemicals and flammable petroleum, it must be perfectly secure. Once the valve is closed, it should not allow the liquid or gas to pass through it under any circumstance.

An perfect example of this kind of valve is one fitted into hot water outlet. When you turn the handle clockwise or counterclockwise, the valve will move up and down. As shown by the image on below, water will flow from the horizontal pipe and come out of the vertical pipe. You can turn the handle to allow different amounts of flow, allowing you to control the amount of water you will get. The green colored component at the bottom is the safety item. When hot water pressure builds up, it will push the safety valve down; the hot water will escape through the bottom and release the pressure. In other words, the designer intentionally lets the valve fail through a safety relief. When the pressure gets too high, it is better to let the valve open and release the pressure, rather than letting the pressure keep building up and destroy your pipe, boiler, or hot water heater.

types of water valves

Specialty pressure relief valve

Water Valve Materials

Different types of water valves can be made from many different materials. They include plastic, brass, cast iron, galvanized pipe, bronze, stainless steel, alloy steels, and gunmetal. These materials are commonly found, depending on the intended application. For seawater or salt water applications, most valves are made of duplex stainless steel for its corrosion resistant properties. When a valve is used for liquid sulphuric acid, Alloy 20 is the most popular material to make it out of. Plastic valves, including PVC, is used for irrigation systems, low pressure, and low temperature applications.

The outer part of valve is called the valve body. While the interior of the valve body is called the seat.  It often has metal parts and a rubber plastic seal to make sure that the opening and closing mechanism is perfectly tight. Most valves are operated manually, while others operate by an automatic mechanism, such as a puppet or mushroom valve in car engine. Every valve should not allow any liquid or gas to escape through the pipe when in a closed position. When there is dangerous or flammable liquid/gas inside it there is a risk of an accident, including explosions or toxicity. Even in a domestic application, a leaking valve can result in an expensive water bill. Depending on the application, turning off a valve may require hard work due to the pressure inside it. This is the reason that you need some sort of lever or wheel to open and close the valve. Learn more how to properly open or close a gate valve, and how to properly operate a ball valve.

How Different Types Of Water Valves Are Rated

Valve ratings are based on their ability to withstand pressure and temperature inside the body. Another common variable is the type of materials it can handle. If a valve has a marking that says “200 WOG”, it means the valve can handle Water, Oil, or Gas (WOG) with maximum pressure of 200 psi. There are many things that affect a valve’s rating, but the most important thing is the materials used. With higher grade materials, and quality controls, the valve’s rating will be higher as well. Certain valves, including those meant for fire protection control, are required to be UL listed. The Underwriters Laboratories are a renowned and internationally recognized testing laboratory.

 

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Balkan Plumbing is the largest sewer and water main company in NYC. For over 60 years, our family's 10 year guarantee* means we stand by our work long after the job is done. For sewer and water main issues throughout Brooklyn, Queens, Manhattan, and the Bronx contact Joseph L. Balkan, Inc. today for 24/7/365 service. Paul R. Balkan, NYC Licensed Master Plumber 01281

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