HIGH PERFORMANCE BUTTERFLY VALVES - MODEL SLHBF & SLHBFFS
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
15
6.4 DISMANTLE THE SEAT RING & SEAT RETAINER
Reconditioning or internal repairs to the valve should only be undergone by an APV approved repairer.
This is only a general guide to serve as an example. The design is different depending on size, class, seat
option, service, etc. Refer the as-built drawing.
- Open the disc of valve (10~15 degree) with operating device.
- Remove the tightened retainer bolts on the seat retainer plate.
- Remove the seat retainer by lifting up with the jacking tap.
- Take out the inner seat. Be careful not to scratch or damage the seat ring. Clean the retainer plate and
seat as well as the other parts of the valve with a soft dust cloth or air blaster.
- Refer to Diagram 6 below for disassembly of the seat retainer & seat ring. There are numerous seat
ring designs & configurations, refer to 6.4.1 seating styles. This is only a generic indicative guide.
- Refer Table A below for retainer bolt torques. The lip-seal seal seat design in non firesafe configuration
up to 125 NB utilises an embedded clamp ring seat retainer in lieu of bolted insert. Refer to as-built
drawing.
DIAGRAM 6
Retainer Bolts
Seat Retainer
Seat Ring
Retainer Bolts
Turn the Disc
10~15 degree to open.
Indicative explosive view only, design will vary depending on size, class, trim, end connections, trim seating type, etc.
Table A
Bolt Size
Carbon Steel Torque (N-m)
Stainless Steel Torque (N-m)
#10
6
3
1/4”
19
8
5 /16”
41
15
3/8”
68
27
7/16”
109
41
1/2”
163
55
