Slide Gate vs. Globe Valve - Valve engineering | Eng-Tips
2002年8月3日 · Since the seating surface is square shaped, it's almost impossible to close the valve fully 100% and since the valve can't be closed fully, whatever be the characteristics of the globe valve (linear or equal percentage or modified linear/equal percentage or hyperbolic), there will always be some leakage and hence 1005 isolation may not be ...
Globe versus Gate Valves - Valve engineering - Eng-Tips
2003年7月29日 · Also, a globe valve can be opened against a high differential pressure, while a gate valve will bind and cannot be opened. If you try to open againast a high DP, the seat will score and leak. Also, a globe valve has a near linear characteritic of Cv vs. % open, while a gate valve has a severe parabolic characteristic and thus cannot be used for ...
Globe versus Ball & Gate valve 6 - Eng-Tips
2010年3月22日 · For on/off "control", an actuated ball valve gives more predictable results than the globe valves with diaphram operators that are often used for dump valves or wellsite ESD valves. I've done the accident investigation on at least 3 fires that the root cause was a diaphragm operated globe valve in on/off service (as a spec break) that leaked ...
Butter fly valves vs. gate valves - HVAC/R engineering - Eng-Tips
2007年10月24日 · After say 2 years, you try to close an open valve, well, chances are, it wouldn't, it could pop on you. gates are good for throttling duty in my opinion, but definitely not for positive shut-off. I am more partial to full port ball valves for shut …
Needle Valves vs Gate Valves 3 - Eng-Tips
2005年12月12日 · The key difference is called "linearity". For a needle valve, the flow vs. valve opening is nearly linear (e.g., if the valve is 30% open then it will pass about 30% of it's maximum flow). The linearity of a gate valve is nearly non-existant. A gate valve will pass 100% of maximum flow at about 25% open. At 10% open it will pass about 5% of ...
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 ...
Selection Between Ball and Globe Valve - Valve engineering
2003年2月15日 · Position indication of a globe valve is on a small plate inside the yoke. Environmental: Rising stem in globe valve drags packing particles out, and environmental dirt in, every time the valve is cycled. ALso if you figure 4 turns to open, globe valve packing sees 16 times the wear on each stroke. Ball valve packing stays tighter-longer.
for the gate,globe and check trim m - Valve engineering
2020年1月8日 · A216 WCB + 13%Cr meaning that the wedge of gate valve is originally cast carbon steel, which later (only) the contact area with seat ring were overlaid with 13%Cr. So the remaining wedge (apart from the seating surfaces) will still A216WCB. This is common practice for medium-bigger size gate valve since less surface should be overlay.
Gate and Globe Valves - Valve engineering | Eng-Tips
2013年6月13日 · Can someone please guide me how to specify integral/ renewable seat rings in Gate and Globe valves. When should we specify integral and when renewable? Is there any code that specifies this requirement. Also, please advise whether all gate/ globe valves will have a back seat. if yes, is there integral/ renewable concept for that as well.
Locke open/cloesed vs car seal open/closed - Valve engineering
2012年1月26日 · Any valve can have a lock or a Car-Seal added to it. These devices would be considered "after-marker add-on". Any standard valve (Gate, Globe, Ball, Plug, Needle, Diaphram, Orbit, Butterfly, etc) can have a locking device or Car-Seal added to it. Conversely any valve that had these devices on them, can have them removed and then they are just ...