Cameron Pow-R-Seal WKM 1 Kurulum, Kullanım ve Bakım Kılavuzu - Sayfa 15

Kontrol Ünitesi Cameron Pow-R-Seal WKM 1 için çevrimiçi göz atın veya pdf Kurulum, Kullanım ve Bakım Kılavuzu indirin. Cameron Pow-R-Seal WKM 1 20 sayfaları. Gate valve

Sayfayı Yazdır
Maintaining Vee-packing
(If so equipped) - Once a year or more often
as required.
1. Valves equipped with Chevron Vee Packing may
require periodic inspection and maintenance to
preclude stem leakage. This is particularly important if
the valves are in service at
temperatures above 250°F (121°C).
2. Other designs use a self-adjusting
stem seal and require only
periodic inspection.
3. Inspect the valve for evidence of
stem leakage. This might be
determined by paint discoloration
Note: Packing is not damaged by cold. However, keep plastic packing in a warm place (like a heated room or vehicle cab) until ready for
use to keep pliable
• Remove the injection stinger from
the packing fitting.
CAUTION: pressure may be trapped
in the packing box
• Apply a good grade of earing
grease to the threads
• Place a stick of packing Into
the fitting and screw in the stinger
until it seats
• Repeat as necessary. Use
screw torques as follows:
3-4 ft-lb (40-50 in-lb, 4-5.5 N-m) for WKM packings
•
4-5 ft-lb (50-60 in-lb, 5.5-7 N-m) for thick packings
•
Do not exceed 7 ft-lb (60 in-lb, 9.5 N-m) as this may exceed
•
the 10,000 psig (689 barg) rating of the fitting
• Back out the screw until the threads show. This allows the bail
check to seat
CAUTION: Apply only enough packing to stop the leak
Installation, Operation and Maintenance Manual
NOTICE
THIS VALVE IS
ASSEMBLED USING A
SELF ENERGIZED STEM
SEAL. INJECT PLASTIC
PACKING ONLY IN
THE EVENT OF A
STEM SEAL LEAK.
Stick Method
E N G I N E E R E D & P R O C E S S V A L V E S
around the bonnet-yoke tube joint. If there is no
evidence of leakage, no maintenance is required. It
is often beneficial to add one stick of packing once
a year to help keep the packing pliable and prevent
future problems. (Couple of "sticks" for larger valves)
4. If leakage is evident, inject plastic packing. See the
Trouble Shooting Section.
• Remove the injection stinger from the packing fitting.
CAUTION: pressure may be trapped in the packing box
• Assemble the packing gun with the
appropriate plastic packing
• Connect the gun to the
packing fitting
• Apply 5500-7500 psi (379-517 bar)
to the packing gun. Thick
packings may require 8000-9000
psi (551-620 bar)
CAUTION: The WKM style packing gun
applies twice the hand pump pressure
• Hold for several minutes
• Add more plastic if the pressure drops
• Repeat until the packing pressure
holds steady
• Do not exceed 10,000 psi (689 bar)
• Remove the packing gun
• Dig out any excess packing from the
packing fitting
• Apply a small amount of bearing grease to the
packing fitting screw
• Install the packing fitting screw and tighten
15
Gun Method
02/2011 / IOM-WKM-GATE-PRS-01