News

Common Functional Designation And Design Types For Valves

Isolation Valves:– Ball, butterfly, diaphragm, gate, pinch, piston and plug valves
Regulatory Valves:– Ball, butterfly, diaphragm, globe, needle, pinch and plug valves
Safety Relief Valves:– Designed as pressure releasing and vacuum relief valves
Non-Returnable Valves:– Swing check and lift check valves
Special Purpose Valves:– Mostly featured as multi-port, float, foot, knife gate and line blind valves
Sizing Of Valves
Valves might be a very small part of any piping process or system with respect to space which is often a substantial portion of the design and build budget. It is found that they have a quite vital impact at the long-term costs and also on the overall performance of the system. Selecting a correct valve size is quite essential in both optimizing costs which ensures safety, accuracy and reliability in operations. The first and the foremost thing which is kept in consideration is the overall size of the valve, in terms of physical dimensions and also in terms of the internal size and flow rates.
Selecting a valve which does not fit in properly in required space can result in additional costs. Choosing a valve that does not provide the ideal flow rate can lead to an inaccurate flow which at least controls the complete system failure. In case the valve is too small, it can cause a reduced downstream flow by creating a back-pressure upstream. In case the valve is too large it can control the flow which can be reduced drastically and further can move from fully opened or fully closed.
While selecting an accurate size, one must consider both the connector diameters accompanied with the overall flow rate of the valve which should be compared according to your needs. There are some valves which offer an excellent flow whereas the others constrict flow and increase the pressure which means that sometimes you should install a larger valve in order to adjust the flow than the adapter diameter alone might imply.
Valve End Connections
Just considering the size and design is not important, it is also important to consider the valve end connections. So, below is discussed a valve end connection about which one must know:
Common Valve End Types:
The implication of such valve end connection is due to the end connection compatible with the piping. At the same time there is also a functional characteristic to the common end type which might make one valve more suited to the requirement as compared to the others.
The common valve end connections includes some more varieties which needs to be understood:
 Screwed or Threaded:- Mostly used in the connections of an instrument or sample points
 Flanged:- One of the most common ends for piping use
 Butt Welded:- Widely used in high-pressure or high-temperature operations
 Socket Welded:- Highly used in small bore piping where threaded connections are not permitted
 Wafer and Lug:- It is commonly used for compact valves installed in systems with limited space
Importance Of Selecting The Valve Material
Depending on the type of use the material with which the valves are build is a critical aspect which ensures the safe operation and reduces the maintenance and replacement cost during the entire life of your operation.
It is commonly known that the valves made of stainless steel are excellent options in a range of processing environment which also includes the corrosive media like the chemicals, saltwater, and acids with complete sanitation standards and processes by using a quite high pressure or high temperature.
Other than this selecting a correct body material should be evaluated for the chemical compatibility which is of utmost importance. In case there are elastomers present in your valve there should be a complete evaluation for its chemical compatibility as well as the limitations of pressure and temperature.
Valve Standards
Selecting a standard of the valve is also important but for that you might need to find that the valve must adhere to the particular standards in order to meet the regulatory requirements for safety, sanitation and other concerns. There are various standard organizations and potential regulations amongst which some common general standard organizations include:
 CSA Group (CSA)
 The American Society of Mechanical Engineers (ASME)
 The American National Standards Institute (ANSI)
 The Manufacturers Standardization Society (MSS)
 The International Organization for Standardization (ISO)
 The Public Health and Safety Organization (NSF)
 NACE International (NACE)
 The American Petroleum Institute (API)


Post time: Sep-22-2021