Emerson Keystone Manuale utente

Before installation these instructions must be carefully read and understood

KEYSTONE SWING CHECK VALVE

Figures 809 to 815 installation and maintenance instructions

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 INCORRECT POSITION

Note hinge

position

Note hinge

position

Normal flow

VCIOM-03382-US 15/06

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.

1 2 3 6 7 4 8 109

KEYSTONE SWING CHECK VALVE

Figures 809 to 815 installation and maintenance instructions

FIGURE 2.

Components

FIGURE 3.

Seat types

Item no. Part name

1Body

2Disc

3Stem

4Spring

5O-ring seat (not shown)

6Washer

7Washer

8Washer

9Washer

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 809 & 810

integral O-ring seat

Figure 810

replaceable O-ring

seat (obsolete)

Figure 810

replaceable metal to

metal seat (obsolete)

Figure 809 & 810

integral hard seat

Symptom Possible Cause Resolution

Valve slamming 1. The valve usually slams as a result of air trapped

downstream of the valve.

Bleed the air traps.

Valve bouncing at closure 1. The disc may bounce due to column separation

upstream of the valve

Add a vacuum breaker.

Valve leaking 1. Check for foreign material caught in the seat.

2. Damaged seat seal.

Remove the material from the seat area.

Replace seat seal.

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.

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