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| Edward
Valves |  |
1.
Stem has ACME threads,
is ground to a fine finish and is hardened to resist wear.
2. Yoke bushing
material has low coefficient of friction which substantially reduces torque and
stem wear and eliminates galling. Mechanical upset locks yoke bushing to yoke.
3. Yoke-bonnet assembly is two piece to facilitate disassembly for faster
in-line internal repairs.
4. Inclined stem construction and optimum
flow shape minimizes flow direction changes and reduces pressure drop.
5.
Body-guided disk utilizes anti-thrust rings to eliminate misalignment, galling
and stem bending.
6. Integral hardsurfaced seat provides positive
shutoff and long seat life.
7. Handwheel on smaller size valves is
rugged and dnobbed to provide sure grip even when wearing gloves. Impactor handle
or handwheel on larger, higher pressure valves provides many times the closing
force of an ordinary handwheel for positive seating.
8. Threaded bonnet
has ACME threads for resistance to galling and ease of disassembly. Unwelded models
utilize a graphitic gasket for dependable sealing. Welded models employ a fillet
weld (canopy weld on stainless steel valves) for absolute protection from body-bonnet
leakage.
9. Stem packing system utilizes flexible graphite packing
material with carbon fiber anti-extrusion rings for optimum sealability and life.
10. Bonnet locking collar.
11. Bonnet seal ring is die formed flexible
graphite gasket seated to a prescribed bonnet torque to provide reliable bonnet
seal.
12. Integral backseat provides a secondary stem seal back up
for positive shutoff and leak protection. |
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