Flowserve Vogt Forged Steel Gate - Manual (Page 35)

Flow Control
Vogt Valves
FCD VVENIM2000-02 Forged Steel Gate, Globe and Check Valves 35
5.14 Vogt Valves Packed With
Fluoropolymer for High-
Pressure Applications
– Standard
See solid assembly arrangement for method utilizing the C-VH
packing rings. All fluoropolymer packing is used, even for the bot-
tom ring. This is a standard fluoropolymer packing method and is
designed to seal on internal pressure. See Figure 3.
5.15 For Vacuum Applications
The C-VH rings should be partially inverted for vacuum applications
because leakage is from outside environment to inside of valve.
Rings should be oriented per Figure 4.
5.16 For Combination Pressure/
Vacuum Applications
The C-VH rings should be oriented per Figure 5.
NOTE: In the event endless fluoropolymer rings are split, they may
be cut at a 45° angle by the use of a razorblade. Install one ring at
a time and stagger the splits in succeeding rings by 90°. Endless
rings are preferred and this requires valves to be disassembled
during repacking.
5.17 Style C-VH Rings
for High-Pressure Service
This design incorporates a heavy wall and heel section necessary to
withstand pressures up to 500 psi and greater.
C-VH rings are recommended for high-pressure applications such
as hydraulic cylinders and pumps. See Figure 3.