It is always better to purchase a quality gate valve rather than replace it frequently. Moreover, an inappropriate gate valve can lead to leaks. Thus, ensure to buy the valve that is long-lasting and cost-efficient. Keep these factors in mind while you find the top valve manufacturer that produces high quality gate valve for the business requirement.
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Material
The gate valves are available in different materials which determines the longevity of the valve also keep in mind what is the use of gate valve to choose an appropriate material for the valve. Some of the materials that you should refer to for a good gate valve have been mentioned below.
PVC
is resistant to corrosion therefore, can be used for corrosive media such as acids, seawater, and chloride solutions. Such materials are mainly used in the irrigation system. The maximum temperature of the material is 60 degrees celsius.
This type of material is appropriate for industries utilizing water, oil, air, or fuel. They have a lesser resistance against corrosion and heat. Their no-resistant property against seawater, and purified water makes them a better choice for small applications utilizing lower pressure.
They are considered the premium material for gate valves due to their high resistant properties. It is resistant to heat, corrosion, and low temperatures. It is not worth purchasing stainless steel if the business does not require high durability and resistance.
They have high resistance against inorganic acids and aqueous solutions that can lead to a quick corrosion of the metals. Their maximum temperature is around 80 degrees celsius.
Design
The gate valve can be divided into two parts based on their design- parallel and wedge-shaped. The parallel gate valves consist of a flat gate placed between the two parallelly organized seats. These kinds of valves have a greater application in petroleum, natural gas, and chemical industries. They isolate and transmit the fluid through the pipe system when closed.
The wedge-shaped gate valve consists of mismatched gate inclination and two inclined seats. These valves can seal high as well as low fluid pressure.
Gate valve standard
Each gate valve has a specific standard dimension or a gate valve standard, thus it is important to choose the different gate valve standards before purchase.
ANSI : ANSI A126, ANSI A181, ANSI B16.10, ANSI B16.34 and ANSI B127.1
Uniform Plumbing Code:
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The copper alloy should be used for the valves measuring 2 inches (50mm). On the other hand, for the valves measuring more than 2 inches (50mm) cast iron or copper alloy body is approved. The gate and its parts should be created from a corrosion-resistant material. The gate valve utilized for the water management system should follow the guidelines of NSF 61 and ASME A112.4.14, ASME B16.34, ASTMF. Furthermore, there should be full-way gate valves for controlling two or more openings.
Underwriters Laboratories (UL):
Specifically designed to meet the standard requirements in UL 262 and FM /, UL Gate Valves are available in several types. such as NRS and, OS&Y.
API Standards: API Spec 6D, API Std 594
Gate Valve Sizes
Different types of gate valves have different sizes. One should have a basic knowledge of the gate valve sizes. The primary size range of the gate valves is 50 NB- 500 NB.
OS and Y Type Forged Gate Valve- 15 NB- 300 NB
Rising Stem, Bolted Bonnet, Flexible / Solid Wedge Gate Valves- 50 NB- 500 NB
Working Pressure
Pressure Nominal Classes: The PN class number determines the standard pressure that a gate valve can withstand. There are different bars to measure the pressure and each bar measures 14. pounds of pressure. Thus if the PN class number indicates 3 bars, then the pressure, in that case, would be around 43. pounds.
PSI Rating: PSI or pounds per square inch is considered the standard measurement for pressure. It mainly determines the pressure of the fluid or the gas flowing through the pipe system. A higher PSI rating indicates higher durability of the valve.
Before selecting your valve, you will need to determine what it will be used for. Will it be used to regulate a fluid or stop its flow?
It is then necessary to verify the type of media that will circulate in the system: is it a gas or a liquid? Is the media corrosive, chemically neutral, a food product or a medical fluid that requires special hygiene conditions?
When it comes to the operation system of the valve it is important to know whether it is powered manually or automatically. In one case, someone must be on-site to operate the valve, while in the other case the valve can be operated remotely, from a control station for example.
Finally, it is important to know how the valve will be integrated into the system and the type of assembly or installation used, especially if it needs to be welded, bolted through flanges or screwed in.
Once you have determined these different elements, you can focus on the technical characteristics of your installation, in particular the flow and pressure that will allow you to determine the dimensions of your valve.