Rising stem VS OS&Y valves
Rising stem VS OS&Y valves
(OP)
Hi ,
is there any difference between the Non rising stem valve & OS&Y valves ? i see some time some ppl used rising stem description and others use OS&Y valve description
Thx
Ahmad
is there any difference between the Non rising stem valve & OS&Y valves ? i see some time some ppl used rising stem description and others use OS&Y valve description
Thx
Ahmad





RE: Rising stem VS OS&Y valves
Open Yoke and Stem (OS&Y) has the thrust bearing outside the valve so may require external lubrication, but it is very easy to see the valve position. This valve also takes more room to operate. The operating wheel does not change vertical position at the valve is operated.
Non rising stem (NRS) does not indicate the position of the valve and is typically buried, this valve remains the same size no mater what the position is nor does the operator wheel or nut move vertically. The thrust bearing is lubricated by the fluid.
Hydrae
RE: Rising stem VS OS&Y valves
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RE: Rising stem VS OS&Y valves
Non-rising stem valves are primarily used on gate and globe valves with cast-iron materials used in water applications with low pressure/temperature requirements. Non-rising stem valves cannot be lubricated externally and require a higher torque.
http://www.eng-tips.com/viewthread.cfm?qid=16760