RE: Floating Vs Trunion Mounted Ball Valves

From: <Engin>
Date: Tue Jul 09 2002 - 09:11:00 EDT

Trunnion Mounted Ball Valves can used for double block service, Floaters can not.
Trunnion Mounted Ball Valves has lower operation torque than the Floater Type.
Trunnion mounted Ball Valve can be purchased with many different seat material option. (critical especially for low strength materials such as PTFE).
Trunnion Mounted Ball Valves are more expensive then Floaters Trunnion Mounted Ball Valves can relief body cavity pressure easier then the Floaters.
Trunnion Mounted Ball Valves can work better under sudden temperature changes. (Because of the spring loaded seats) Trunnion mounted Ball Valves (standard) seat with upstream seats. Floaters with down stream seats.
Trunnion Mounted Ball Valves can seal on both seats if specified. (double action seat feature, If upstream seat leaks down stream will seal) Most of the Trunnion Ball Valves has seat emergency grease fittings as standard.
Most trunnion mounted Ball Valves are monogrammed per API6D. Soft seated Floater limits are about

	 150 Class up to 12"
	 300 Class up to 10" - 12"
	 600 Class up to 4-6"

I wouldn't use floater for larger than 6" under full pressure rating.
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let me know if you have any further questions

Engin

-----Original Message-----
From: Hari Prasad, Macharla [mailto:macharla777@yahoo.com] Sent: Tuesday, July 09, 2002 3:38 AM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Floating Vs Trunion Mounted Ball Valves

Hi All,
Can anybody elaborate the criteria for deciding the Trunion Mounted Ball Valves for various duty requirements. How does it vary with reference to Size and Rating? What are the basic advantages of Trunion Valves over Floating Ball Valves?
Can you please advise any source of Literature in this regard.
Regards
hari

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[Non-text portions of this message have been removed] Received on Tue Jul 09 09:11:00 2002