You might also see valves classified by function instead of design.
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Common functional designations and their common design types include:
While valves might be a small part of your piping process or system in terms of space, they&#;re often a substantial portion of the design and build budget. They also have a significant impact on long-term costs and overall system performance.
Choosing a proper valve size is essential to both optimizing costs and ensuring safe, accurate, and reliable operation.
The first thing to consider is the overall size of the valve -- both in terms of physical dimensions and in terms of internal size and flow rates (CV).
Choosing a valve that does not fit properly in the space required could result in added costs. Choosing a valve which does not provide the ideal flow rate can lead to inaccurate flow control at the least and complete system failure at worst.
For example, if your valve is too small, it could cause reduced flow downstream while creating back-pressure upstream. If the valve is too large, you&#;ll find that flow control is drastically reduced the further you move from fully open or fully closed.
When choosing the proper size, be sure to consider both the connector diameter and the overall flow rate of the valve compared to your needs. Some valves offer excellent flow while others constrict flow and increase pressure.
This means sometimes you must install a larger valve to adjust for flow than the adapter diameter alone might imply.
With sizing and design out of the way, it&#;s also important to consider valve end connections.
Common Valve End Types. Source: Unified AlloysWhile the most obvious implication here is choosing an end connection compatible with your piping, there are also functional characteristics to common end types that might make one valve more suited to your needs than another.
Common valve connections and ends include:
For more Gate Valves Are Most Commonly Operated Byinformation, please contact us. We will provide professional answers.
Depending on your intended use, the materials with which your valves are made might be a critical aspect in ensuring safe operation and reducing maintenance and replacement costs over the life of your operation.
Stainless steel valves are excellent options in a range of processing environments, including those involving corrosive media (such as chemicals, saltwater, and acids), environments with strict sanitation standards (such as food and beverage manufacturing and pharmaceuticals), and processes involving high pressure or high temperatures.
However, if you are processing solvents, fuels, or volatile organic compounds (VOCs), choosing a valve material from a non-sparking material -- such as brass, bronze, copper, or even plastic -- is often a better option. In addition to selecting the correct body material, internal (wetted) trim parts should be evaluated for chemical compatibility as well. If your valve contains elastomers, they should also be evaluated for their chemical compatibility as well as pressure and temperature limitations.
Depending on your intended usage, you might find that valves must adhere to particular standards to meet regulatory requirements for safety, sanitation, or other concerns.
While there are too many standard organizations and potential regulations to cover in detail, common general standard organizations include:
There are also industry-specific standards to consider.
Major standards organizations by industry include:
Choosing the right valve for your project might seem complex. However, by starting with general characteristics -- such as valve design, valve size and actuation method -- you can quickly limit your options to determine the best valves for your needs.
Whether you&#;re designing a new processing system or looking to make upgrades to or maintain an existing system, Unified Alloys&#; selection of valves and fittings can help you find the ideal solution for your application and usage environment. As a leading provider of stainless steel alloys, valves, flanges, and more, our experts have helped industries across Canada and North America for more than 4 decades. Need assistance or have a question? Contact us for personalized help.
No, gates are not used for throttling flows in other than aquarium situations. Faucets in your house are more like globe valves in older faucets and cartridge type valves similar to ball valves in newer faucets. You may have a gate valve on the incoming water line from your water meter but it is intended to be fully open or fully closed only for maintenance.
When you are under house or boosted pressure and throttle with a gate you are causing cavitation across the gate and seat areas due to the velocity and pressure drop. Say you have 60 psi on one side and an open pipe or hose on the other, the velocity across the small cross surface area that is open is sonic velocity and causes tremendous wear plus vibration between the gate and the threaded shaft which leads to more wear. In an aquarium we may have 4 feet of head (1.7 psi) to dissipate across one side to the other so wear is negligible. Its rare to find an aquarium pump that pumps more than say 15-16 feet of head or less than 7 psi and most are in the 11-12 feet of head range or about 5 psi, you can put your finger over the end of the pipe and stop the flow.
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