Commissioning; Preparatory Activities - Flowserve Valtek Valdisk User Instructions


Fully close the valve before and during the installation
process with pneumatic supply or handwheel (if provided)
Ensure that the disk is parallel with the seat retainer when
in the fully closed position. If it is not, adjust the closing
stop in the actuator. Tighten the seat retainer screws to
hold the seat retainer in place and ensure that the seat
retainer sealing surface is equi-distant from the body
surface.
Keep hands, hair, clothing, away from
the rotating disk and the seat when
operating the valve. Failure to do so could cause serious
injury.
Because of the Valtek Valdisk self-
centering seat, there is no reason to
open the valve at any time during installation. Therefore,
the valve should remain closed until the valve is fully
installed.

Connect air supply and instrument signal. Throttling valves
are usually equipped with valve positioners. Two
connections are marked for the air supply and for the
instrument signal. Both Valtek cylinders and positioners
are suitable for 150 psi air supply. An air regulator is
required based on the maximum supply pressure specified
on the actuator and data sheet. An air filter is
recommended unless the supply air is unusually clean and
dry. All connections must be free of leaks.
On valves equipped with air filters, the
air filter bowl must point down;
otherwise, the air filter will not perform properly.

Make sure proper clearance exists internally in the mating
piping to permit proper disk rotation.
VAIOM000286-02 (EN/AQ) May 2023
Valtek Valdisk High-Performance Butterfly Control Valves
Figure 4: Cross-Sections of Seat Retainer Configurations

Install valve in line by tightening opposite line bolts together
in a minimum of 25% increments of the total recommended
torque while alternating the tightening pattern until all line
bolts have achieved the standard recommended torque.
Lug style valves should have at least 1
diameter of thread engagement in all holes.
2/3 diameter thread engagement or more is allowed on holes
adjacent to body neck and shaft flange neck on lug, wafer, and
double flange.

9 Commissioning

9.1 Preparatory Activities


Check for full stroke by making the appropriate instrument
signal change. Observe disk position indicator plate
mounted on the transfer case or the disk position indicator
symbols shown on the gland flange and shaft. The disk
should change position in a smooth, rotary fashion and
should rotate 90 degrees.

Check all air connections for leaks. Tighten or replace any
leaky lines.

Evenly tighten the packing nuts to slightly over finger tight.
Do not overtighten packing. This can
cause excessive packing wear, high
stem friction that may impede plug movement and can
damage the packing. Over-tightening the packing will not
reduce the stem seal leakage if the packing has been
previously damaged. Damaged packing should be
replaced.
If the valve has been in operation for a brief time, check the
torque on the packing nuts. If packing leaks occur, tighten the
packing nuts only enough to stop the leakage.
Page 9 of 22