KEYSTONE SWING CHECK VALVE
Figures 809 to 815 installation and maintenance instructions
Before installation these instructions must be carefully read and understood
The Figure 809 to 815 valves are simple to
maintain and operate. No special tools are
required for any of the procedures described
below.
Spare Parts
The recommended spare parts for the Figure
809 to 815 are:
1. Spring
2. Seat O-ring, if applicable
Storage Requirements
For best results store the valve on a pallet in a
clean dry warehouse. If a clean, dry warehouse
is not available, always do the following:
1. Keep the valve off the ground and high
enough to avoid standing water.
2. Cover the valve with a water repellant cover
(not supplied by (Emerson) and keep protected.
Installation Guidelines
Insert the valve between two flanges with
gaskets. Install the Figure 809 between ASME
300 flanges or standard 250 cast iron flanges.
Install the Figure 810 between ASME 150
flanges or standard 125 cast iron flanges. See
Figure 1 for correct installation positions.
CAUTION
1. Never use the valve with reciprocating
compressors or in other pulsating services.
2. Position the valve to promote smooth flow.
3. Allow clearance for disc movement.
FIGURE 1.
Installation positions, elevation view
CORRECT POSITION
Note hinge
position
Normal flow
INCORRECT POSITION
PROCEDURES
Operation Procedure
The Figure 809 to 815 valves are fully automatic
in operation as received. No special procedures
are required for shutdown. Valves are ready for
operation as received. Do not adjust.
CAUTION
1. Do not attempt to open the valve against
pressure or static head. Personal injury as
well as damage to the valve will occur.
2. Keep media free of air bubbles, as they
may cause damage to the valve. Air trapped
downstream of the valve may cause
uncontrollable slamming and water hammer
on pump shutdown.
Emerson.com/FinalControl
Note hinge
position
© 2017 Emerson. All rights reserved.
Normal flow
Normal flow
Normal flow
VCIOM-03382-US 15/06
KEYSTONE SWING CHECK VALVE
Figures 809 to 815 installation and maintenance instructions
Maintenance Procedure
The maintenance requirements of the
Figure 809 to 815 are minimal. No
lubrication is required. In the event a part
requires replacement, following are the
valve disassembly/-assembly instructions
referencing Figure 2.
1. Place the bottom of the valve in a vise.
Protect the valve faces by using wooden (or
other suitable material) spacers between
vise faces and valve faces.
2. Remove the pipe plug (10).
3. While holding the disc (2) in place, pull the
stem (3) out of the body (1).
4. Remove the washer (6 to 9 depending on the
valve) and spring (4).
5. Set the disc aside.
6. If seat (11) replacement is required, proceed
to seat replacement procedure.
7. Replace worn parts.
8. Place the washers (6 to 9), spring (4) and
disc (2) into the valve body as shown in the
SMO drawing. Run the stem into the body
through the first set of washers, first arm of
disc, spring, second arm of disc and last set
of washers.
9. Seal the pipe plug threads with PTFE tape
and install the plug.
10. Push the disc completely open several times
by hand to ensure the disc is not binding and
to verify proper seating.
FIGURE 2.
Components
1 2 3 6 7 4 8 109
Item no. Part name
1 Body
2 Disc
3 Stem
4 Spring
5 O-ring seat (not shown)
6 Washer
7 Washer
8 Washer
9 Washer
10 Pipe plug
11 Not shown
Seat Replacement Procedures
Identify the type of seat. See Figure 3 for
drawings of the different seat types.
If the valve has an integral O-ring seat, proceed
to Step 1 below. If the valve has replaceable
O-ring or replaceable metal-to-metal seat,
it is obsolete and no replacement seats are
available. A new valve must be purchased. If the
valve has an integral metal-to-metal seat, the
seat is not repairable because it is machined
directly into the body.
1. Cut the O-ring and pry it out of the dovetail
groove. Take care not to damage dovetail
groove. Throw the old seat away.
2. Lubricate the new O-ring with silicone oil.
3. Place the O-ring in the dovetail groove that
is machined into the body.
4. Verify that the O-ring is not twisted or
pinched.
FIGURE 3.
Seat types
Figure 809 & 810
integral O-ring seat
Figure 809 & 810
integral hard seat
Figure 810
replaceable O-ring
seat (obsolete)
Symptom Possible Cause Resolution
Valve slamming 1. The valve usually slams as a result of air trapped
downstream of the valve.
Valve bouncing at closure 1. The disc may bounce due to column separation
upstream of the valve
Valve leaking 1. Check for foreign material caught in the seat.
2. Damaged seat seal.
© 2017 Emerson. All rights reserved.
Bleed the air traps.
Add a vacuum breaker.
Remove the material from the seat area.
Replace seat seal.
Figure 810
replaceable metal to
metal seat (obsolete)
2
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