Flowserve Vogt Forged Steel Gate - Manual (Page 46)

Flow Control
Vogt Valves
46 Forged Steel Gate, Globe and Check Valves FCD VVENIM2000-02
5.24 Vogt Valve
Lubrication Points
Recommended Lubricant
Flowserve recommends a high-pressure and temperature lubricant
such as Dow Corning Molykote™ G-N Paste or similar.
Gate Valves, O.S. and Y. Design (Figures 8-12)
There are two points to be lubricated for Vogt Gate Valves, the stem/
yoke nut threads and the yoke nut/bearing ring area. Lubricate as
follows:
1. For those Vogt Gate Valves with a single grease fitting (figure 9),
note that lubricating through this fitting only reached one of the
lubrication points, which is the yoke nut/ bearing ring area. The
stem and yoke nut threads shall be lubricated as noted in (3)
below.
2. For those valves with double grease fittings (figure 10) both
lubrication points can be reached through these fittings. Both
fittings must be used to lubricate the two points.
3. For those Vogt Gate Valves with no grease fitting (figure 8),
lubricate the two reached points as follows:
a) Open the valve to mid-stroke. Brush lubricant on the stem
thread that protrudes through the handwheel and on the
stem thread under the yoke. Fully open and close the valve.
The stem/yoke thread is now lubricated.
b) Open the valve slightly, this creates a clearance at the bear-
ing ring area. Liberally brush lubricant on the bearing ring
area. Close the valve. This distributes the lubricant to the
bearing ring and the outside diameter area of the yoke nut.
Note: The approach detailed in #3 can also be used for
those Vogt Gate Valves with a single or double grease fit-
ting, at the option of the end-user.
Globe/Angle Valves, O. S. and Y. Design (Figure 4)
With one exception, Vogt Globe Valves have one point of lubrication:
the stem/yoke nut threads. The one exception is the Vogt Series
810, 811 and 822 valves, which shall be lubricated per the Gate
Valve instruction #3 above. Lubricate globe valves as follows:
1. For those Vogt Globe Valves with a grease fitting (Figure 9),
lubricate through the fitting.
2. For those Vogt Globe Valves with no grease fitting (Figure 8)
open the valve to mid-stroke and brush lubricant on the stem
thread both above and below the yoke nut. Fully opening and
closing the valve will lubricate the stem threads.
Gate/Globe/Angle Valves, Inside Screw Stem (ISS) Design
These valves have no lubrication points. They shall be used in ap-
plications in which the service fluids lubricate the valve.
Check Valves, All Vogt Types
These valves have no lubrication points.
Motor-Operated Gate/Globe/Angle Valves
These valves are supplied with an actuator that includes a thrust
base with mating stem nut. There is only one lubrication point,
the stem thread/actuator stem nut. To lubricate the stem thread,
proceed as follows:
Using the actuator, fully open the valve. Remove the plug from the
top side of the actuator, and use a long brush inserted through the
actuator opening to brush lubricant onto the valve stem threads.
Stroke the valve closed. The stem thread is now lubricated. Replace
the pipe plug back into the actuator opening.
Lubrication of the actuator shall be done in accordance with the
maintenance provisions in the actuator manual.