Ball Valve Vs Plug Valve Process - Valve engineering - Eng-Tips
2007年1月31日 · Ball valves disrupt the flow of the medium less than other types of valves, but the flow cannot be changed; plug valve flow, however can be changed by changing the size and shape of the plugs and seats. Plug valves are, moreover, more cost effective on high pressure applications; ball valves can also handle high pressure, using the trunnion ...
Lubricated plug valve vs. ball valve for natural gas service 2 - Eng …
2008年12月1日 · Principally I agree with zdas04, but the real valve selection should be based on the full technical appplication set of data for any valve and service, for instance minimum pressure for and after, temperature (medium and surrounding), flow, purity and full descroption of fluid, on/off or regulation, manual or mechanical operated (with details), any design or safety …
Plug valve vs. butterfly valve for manual balancing 2 - Eng-Tips
2006年10月17日 · "NONLUBRICATED" plug valves are actually better lubricated that the lubricated types. In a nonlubricated plug valve the plug rides in a (usually) PTFE sleeve. Set-torque of a nonlubricated plug valve peaks at around 72 hours, as the TFE sleeve cold-flows to match whatever microscopic imperfections exist in the surface of the plug.
Ball valve partially open - Valve engineering - Eng-Tips
2011年8月14日 · Actually, people do mount gear operators or actuators and rotary positioners on ordinary ball valves, plug valves and even butterfly valves, and use them for throttling and control applications. A slot or vee notch in the ball or plug (greatly) improves the Cv versus %travel characteristic but is not absolutely necessary.
12" Force Main-Ball Valve vs Gate Valve 3 - Eng-Tips
2004年12月23日 · This valve has a full bore, seat sealing fastened on the ball turned away from main stream when open, and in addition fairly large open room between ball and inner wall of housing beeing flushed clean by faster flowing part of main stream. This has proven a very dependable, trouble-free solution. Price at least as high as plug-valves.
Globe vlave vs Plug and cage choke valve - Valve engineering
2003年3月31日 · Which covers but not limited to Gate(single/double), Wedge , Globe, Disc (for Swing Check as well as Gate), Ball (V-ball, full ball, etc.) and Plug (Globe, Choke, Plug valve, Diaphragm valve). Plug is a more convenient term to pronounce since most of the time we refer it to a conical (male) shape of the sealing element, as for the seat inner ...
POsition Seated Vs Torque seated Valve - Valve engineering - Eng …
2013年5月13日 · In the 1970's quarter turn valves became widely available. The first of these position seated valves was the plug valve followed by the now-ubiquitous ball valve. Full shut occurs when the seat completely blocks the flow path and going further would open the flow path on the other side. David Simpson, PE MuleShoe Engineering
The torque on a plug valve and/or ball valve - Valve engineering
2003年8月20日 · In general a plug valve will have a higher torque than an equivalent size ball valve. This is due to the increased seating area of a standard rotary plug valve. Being that you will require a 30" ball valve it will most likely be trunnion mounted and have a substantially lower torque requirement than your current plug valve.
Number of turns to operate large ball or plug valve 1 - Eng-Tips
2011年3月3日 · The valve manufacturer will then size a gearbox to suit. We have some Class 900 36" full bore ball valves which require 360 turns to operate fully closed to fully open, 36" reduced bore balls and 30" full bore with 240 turns. Cheers, John
V-notch ball vs regular ball - Valve engineering | Eng-Tips
2023年1月27日 · High solids content could erode the downstream seat in a traditional ball valve when the valve operates. During operation, the downstream seat is exposed directly to the media flow. This is avoided with a v-notch type ball valve when the seat is on the upstream side of the valve. But keep in mind that "solid content" is a very vague description.