- Industry: Industrial valves
- Number of terms: 3113
- Number of blossaries: 0
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A valve that does not have integral line flanges. This type of valve is sometimes referred to as a Wafer Style valve. The valve is installed by bolting it between the companion flanges with a set of bolts or studs called line bolting. Care should be taken that strain-hardened bolts and nuts are used in lieu of all-thread, which can stretch when subjected to tempera-ture cycling.
Industry:Industrial valves
A valve is said to have dual seating when it uses a resilient or composition material such as TFE, Kel-F, or Buna-N, etc. For its primary seal and a metal-to-metal seat as a secondary seal. The idea is that the primary seal will provide tight shut-off Class VI and if it is damaged the secondary seal will backup the primary seal with Class IV shut-off.
Industry:Industrial valves
A trim arrangement that tends to equalize the pressure above and below the valve plug to minimize the net static and dynamic fluid flow forces acting along the axis of the stem of a globe valve. Some regulators also use this design, particularly in high pressure service.
Industry:Industrial valves
A valve design that dissipates relatively little flow stream energy due to streamlined internal contours and minimal flow turbulence. Therefore, pressure down stream of the valve vena contracta recovers to a high percentage of its inlet value. These types of valves are identifiable by their straight-th rough flow paths. Examples are most rotary control valves, such as the eccentric plug, butterfly, and ball valve.
Industry:Industrial valves
A valve design that dissipates a considerable amount of flow stream energy due to turbulence created by the contours of the flow path. Consequently, pressure downstream of the valve vena contracta recovers to a lesser percentage of its inlet value than a valve with a more streamlined flow path. The conventional globe style control valve is in this category.
Industry:Industrial valves
A valve body whose flange connection is an integral or cast part of the body. Valves with integral flanges were traditionally known to have the ANSI short face-to-face dimension ANSI/ISA S75. 03. However many manufacturers now produce valve bodies with both integral and separable flanges that will meet both the ANSI short and long face-to-face dimensions.
Industry:Industrial valves
A type of globe style valve trim where the valve plugs with the seat.
Industry:Industrial valves
A term usually applied to self-contained regulators describing the range of set point adjustment available for a particular range spring.
Industry:Industrial valves
A term used to describe valve trim with an elastomeric or plastic material used either in the valve plug or seat ring to provide tight shutoff with a minimal amount of actuator force. A soft seated valve will usually provide CLASS VI seat leakage capability.
Industry:Industrial valves
A term used to describe the ratio between the minimum and maximum flow conditions seen in a particular system. Example: If the minimum flow were 10 G. P. M. And the maximum flow were 100 G. P. M. The turndown would be 10:1. This term is sometimes incorrectly applied to valves. See rangeability.
Industry:Industrial valves
