Watts LF007-FZ Manuel D'installation, De Maintenance Et D'essai page 3

Servicing the Check Valves
NOTICE
Before servicing, ensure the supply water is turned off or the shutoff
valves are in the closed position. Open test cocks No. 2, No. 3,
and No. 4 to relieve pressure inside the before removing the
valve cover.
1. Remove the cover, then remove the retainer from the body valve.
The check valve modules can be removed from the valve by
hand or with a screwdriver.
NOTICE
For Series 007 and LF007, sizes
of the first and second check modules are not interchangeable.
The heavier spring and smaller diameter seat belong with the first
check module. Series 007M1 sizes ¾" to 1" and Series 007M2
size ¾" have interchangeable seats and springs.
2. The check seats are attached to the cage with a bayonet type
locking arrangement. Holding the cage in one hand, push the
seat inward and rotate clockwise against the cage. Series 007M2/
LF007M2 size ¾" and LF007 have a pull­apart seat and cage.
The seat, cage, and spring and disc assembly are individual
components.
3. Clean and reassemble the disc assembly or, depending on its
condition, discard and replace it with a new assembly from the
repair kit. O­rings should be cleaned or replaced as necessary.
4. Reassemble the check valve module in the reverse order. Check
modules are installed in the valve body with the seats facing the
valve inlet. The modules must be securely in place before the
retainer is replaced. On sizes ¾" to 1" this retainer may have to
be tilted slightly into place. Replace the cover, and close all
test cocks before returning the valve to service.
1 ⁄ " ­ 2", the seats and springs
2
O­rings
Spring
Seat Disc
Cover
Cover
O­ring
Retainer
Seat
Seat
O­ring
Disc
Assembly
Spring
Check
Cage
Cover
Cover
O­ring
Check
Cage
Body
Retainer
Body
3