Globe Valves With Fully Body-Guided Disc Handles Flow At High-Pressure Differentials
The new generation of globe valves with fully body-guided disc have an excellent ability to handle flow at high-pressure differentials.
API 623 in it's new edition requires that all globe valves must have there disc fully body guided, in order to hold the disc for supporting the hydraulic forces and vibrations when the valve is in severe throttling. The main purpose of this design is not to tractor lateral forces to the stem, because the allowances between the stem and the disc are larger than the allowances between the body guides and the disc. This keeps the valve packing in position and prevents leakage.
When selecting a Globe valve, the parameters of:
a) Type of fluid
b) Inlet pressure & Inlet temperature
d) Required pressure drop across the valve
|SPECIFICATIONS FOR STEEL GLOBE VALVES|
|Pressure rating and size:||PN10,PN25,PN40,PN64,150L-600LB|
|DN40 to DN600|
|Material:||Body : A216-WCB,A325-LCB,A217-WC6,CF8,CF8M|
|Disc : A105+13Cr, SS304, SS316|
|Stem : A182+F6a,A182-F6a|
|Structure:||stopcock for water|
|Flange connection:||ASME B16.5,EN1092|
|Butt-weld ends:||ASME B16.25|
|Temperature:||-20 to 425°C|
A Globe valves is a linear motion valve and are primarily designed to stop, start and regulate flow.
The disk of a Globe valve can be totally removed from the flowpath or it can completely close the flowpath.
Conventional Globe valves may be used for isolation and throttling services. Although these valves exhibit slightly
higher pressure drops than straight=through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure
drop through the valve is not a controlling factor.
Because the entire system pressure exerted on the disc is transferred to the valve stem, the practical size limit for these
valves is NPS 12 (DN 300). Globe valves larger than NPS 12 (DN 300) are an exception rather than the rule. Larger
valves would require that enormous forces be exerted on the stem to open or close the valve under pressure. Globe
valves in sizes up to NPS 48 (DN 1200) have been manufactured and used.
Globe valves are extensively employed to control flow. The range of flow control, pressure drop, and duty must be
considered in the design of the valve to avert premature failure and to assure satisfactory service. Valves subjected
to high-differential pressure-throttling service require specially designed valve trim.
Generally the maximum differential pressure across the valve disc should not exceed 20 percent of the maximum
upstream pressure or 200 psi (1380 kPa), whichever is less. Valves with special trim may be designed for applications
exceeding these differential pressure limits.
Advantages and disadvantages of Globe valves
Typical Applications of Globe valves
The following are some of the typical applications of Globe valves:
We choose suitable wood cases according to different valves and arrange skilled workers to pack in case of bruise. Long term cooperated forwarder will book space, clear customs and transport for us without delay. There are three ways for transportation, by sea, by air and by train. We will arrange transportation according to customers' needs.
Delivery Details: According to the order, 7~60days
Contact Person: Ms. TOBO
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