- Industry: Industrial valves
- Number of terms: 3113
- Number of blossaries: 0
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A guiding system where the valve stem is larger in the area that comes into contact with the guide busings than in the adjacent stem area.
Industry:Industrial valves
A hollow cylindrical trim element that is sometimes used as a guide to align the movement of a valve plug with a seat ring. It may also act to retain the seat ring in the valve body. On some types of valves, the cage may contain different shaped openings which act to characterize the flow through the valve. The cage may also act as a noise attenuation or anti-cavitation device.
Industry:Industrial valves
Also known as an Electro-Mechanical Actuator uses an electrically operated motor-driven gear train or screw to position the actuator stem. The actuator may respond to either a digital or analog electrical signal.
Industry:Industrial valves
Also known as the final control element. A power-operated device used to modify the fluid flow rate in a process control system. It usually consists of a body or valve and an actuator, which responds to a signal from the controlling system and changes the position of a flow controlling element in the valve.
Industry:Industrial valves
Also known as a slip-on flange. A flange that fits over a valve body flow connection. It is generally held in place by means of a retaining ring. This style of flange connection conforms to ANSI/ISA 275. 20 and allows for the use of different body and flange materials. Example: A valve with a stainless steel construction could use carbon steel flanges. This type of valve is very popular in the chemical and petro-chemical plants because it allows the use of exotic body materials and low cost flanges.
Industry:Industrial valves
Also called #6 Stellite or Alloy 6. A material used in valve trim known for its hardness, wear and corrosion resistance. Stellite is available as a casting, barstock material and may be applied to a softer material such as 316 stainless steel by means of spray coating or welding.
Industry:Industrial valves
A valve with a positioning actuator using a self-generated power signal for moving the closure member relative to the valve port or ports in response and in proportion to the changes in energy of the controlled variable. The force necessary to position the closure member is derived from the fluid flowing through the valve.
Industry:Industrial valves
A valve with a flexible linear motion closure member that is forced into the internal flow passageway of the body by the actuator. Pinch or Clamp valves and Weir-type valves fall into this category.
Industry:Industrial valves
A valve with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. Butterfly valves come in various styles including eccentric and high-performance valves. Butterfly valves are high recovery valves and thus tend to induce cavitation in liquid services at much lower pressure drops and fluid temperatures than the globe style valve. Due to instability problems with the older design butterfly valves, many people will limit the travel of the valve at 60 degrees of rotation on throttling services. This can also help keep the valve out of cavitation problems.
Industry:Industrial valves
A valve plug that fits inside the seat ring, which acts as a guide bushing. Examples: Splined Plug, Hollow Skirt, and the Feather-Guide Plug.
Industry:Industrial valves
