Advertisement
Pressure Seal Gate Valves -Style A-
Installation and Maintenance Instructions
Fig. no. 5
Please refer to Figure no. 5.
1.
Unscrew the body bonnet nuts (pos.12) and the gland nuts (pos.16)
2. Lift up the yoke (pos.24) operating by the handwheel or gearbox handwheel
3. When the stem nut is free from the stem threads, lift up the yoke.
4. Unscrew the nuts (pos.31).
5. Remove the retaining ring (pos.311).
6. Remove the segment rings, push them out from the body groove by using the body holes
placed radially on the top of the body.
7. Lift up the bonnet (pos.6) and pressure seal body gasket (pos.5). Make sure not to damage the
packing. We suggest to replace the packing when changing the body gasket.
8. Carefully clean all the gasket housing and lubricate with suitable grease.
9. Replace the body gasket.
10. Reassemble all parts following backwards the above mentioned steps.
Section 4 - Valve Removal
If the valve needs to be removed from the line for some extraordinary reason, the user should
ensure the following:
1. The valve is depressurized, drained and vent.
2. The pipe shall be cut as far away from the valve as possible.
Section 5 - Greases and Special Tools
5.1 Greases
To lubricate the bearings on manual and gearbox operated valves, we suggest to use the grease
AGIP GRMUEP2 or an equivalent product, as showed in the following table:
Table III: Grease and Lubricant List
Manufacturer
Grease
AGIP
GRMUEP2
API
PGX2
BP
GREASE LTX2
ESSO
BEACON 2
FINA
FINAGREASE HP FINAGREASE EPL2
MOBIL
MOBILUX EP2
Q8
REMBRANDT EP2
SHELL
ALVANIA R2 SUPERGREASE A
TEXACO
MULTIFAK EP2 GREASE L2
TOTAL
MULTIS EP2 MULTIS 2
VISCOL
SIGNAL ROLSFER 2
STATOIL
UHIWAYLI LI G2
For the lubrication of the stem thread, use the grease SIGNAL CEP 30 produced by Viscol. As an
alternative you can utilize:
- CEPLATTYN 300 produced by REINER-FUCHS
- GRAFLOSCON produced by KLUBER
You can also use a grease having more than 25% pure graphite content (carbon 98%) granulometry
5m, without any abrasive agent.
For the lubrication of the actuator, refer to the relevant manual.
5.2 Special Tools
No special tool required for the Maintenance Operation described in this Manual.
Emerson reserves the right to change the contents without notice
Lifting lugs
For DN = 4"
for DN = 6"
Caution
The nuts (pos.31) need to be retightened
after valve first pressurization, as indicated
in Table II.
page 6
For DN = 3"
Advertisement
