Flowserve Valtek Tek-Check Installation, Operation & Maintenance Instructions page 2

Bonnet
(Item No. 40)
Retainer Gasket
(Item No. 56)
Bonnet Gasket
(Item No. 58)
Half Ring
(Item No. 11)
Body
(Item No. 1)
Orifice
(Item No. 130)
Seat Ring
(Item No. 20)
(upstream)
Seat Ring
Gasket
(Item No. 55)
End Flange
(Item No. 10)
NOTE: Item numbers correspond directly to valve's bill of material. Refer to it for specific part numbers.
Quick-check
After valve is installed in the line, check for correct
operation as follows:
1. Pressurize line, both upstream and downstream, of
the valve.
2. Drain off upstream pressure until valve closes. Most
valves mounted in a horizontal pipeline should close
when the upstream pressure is one psi (0.07 Bar)
less than the downstream pressure.
3. Increasing the upstream pressure to five psi (0.34
Bar) more than the downstream pressure should
open valve.
4. When valve is closed, check for noticeable leakage.
If leakage exists, refer to the 'Troubleshooting' sec-
tion.
GENERAL MAINTENANCE ON NON-SLAM
PISTON CHECK VALVES
Disassembly
To disassemble the non-slam piston check vale, refer to
Figure 1 and proceed as follows:
19-2
Figure 1: Non-slam Piston Check Valve
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
(downstream)
WARNING: Drain all the fluids from the valve and
depressurize the line to atmospheric pressure. Fail-
ure to do so can cause serious injury.
1. Remove bonnet flange bolting and lift bonnet flange
and bonnet out of the valve. If the valve is installed
in a vertical line, remove spring found between the
piston and the bonnet.
WARNING: Bonnets on valve size 8-inch and
larger are heavy and should be lifted with a hoist
using the lifting ring attached to the top of the
bonnet. Failure to do so can cause injury.
2. Lift piston, retainer, gaskets, and seat ring out of the
body. Check for signs of galling and scoring be-
tween the piston and retainer. If galling exists, call
your Flowserve representative.
3. Check piston seals for wear. Replace if necessary.
4. Check for dirt buildup in piston's ball check valve.
Remove ball seat using a screwdriver. A slot is
provided in the top of the seat for easy removal.
Remove ball and spring. Check spring for breakage
and dirt. Replace broken or damaged parts.
Lifting Ring
(Item No. 210)
Bonnet Flange
Bolting
(Item No. 108/114)
Bonnet Flange
(Item No. 70)
Retainer
(Item No. 30)
Piston Seal
(Item No. 65)
Ball Seat
(Item No. 65)
Ball
(Item No. 132)
Spring
(Item No. 133)
Piston
(Item No. 50)