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a_m_shiha
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Join Date: Nov 2008
Posts: 91

Ball Valve Sliding Stem

02/10/2009 4:33 AM

I have technical data sheet for shutdown valve says that the valve type is sliding stem shut-down ball valve is that applicable?

i think this is wrong becouse ball valve is rotating stem valve isn't it?

regards
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The Prof
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Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
Posts: 767
Good Answers: 58
#1

Re: Ball Valve Sliding Stem

02/10/2009 9:22 PM

Shiha,

The data sheet is not wrong there are ball valves with "sliding" stems. I am more familiar with the term "rising" stem which I think is the industry accepted term.

Search google using valve rising stem ball gives 34000 odd results.

One well known one is http://www.c-a-m.com/content/products/product_detail.cfm?pid=2971

__________________
 If you can't explain it simply, you don't understand it well enough. (A.E.)
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a_m_shiha
Commentator

Join Date: Nov 2008
Posts: 91
#2
In reply to #1

Re: Ball Valve Sliding Stem

02/11/2009 1:51 AM

I think rising stem is different from sliding stem

as in the link you attached:

The key to the success of the valve is the rising stem that lifts the ball away from its seat before turning, so that the seats are protected from wear and degradation from the rotation.

anyway thank you a lot this is new information for me about rising stem

regards
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