Instruction manual

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15.

Maintenance Procedures - Model DDX

Deluge Valve

Refer to Figs. 2, 5, & 6.

Mechanical sprinkler alarm (water motor–not

shown) not operating:

This is most likely caused by a clogged screen in the

strainer of the water motor. Proceed as follows: Re-

move plug from the strainer. Remove and clean the

screen. Replace the screen and the plug, and then

tighten securely (Ref. Bulletin 613).

Leakage out of the ball drip valve E (Fig. 6).

Water leakage due to a water column above

the Deluge Valve’s clapper:

This condition can be caused by leakage past the

system side of the Model DDX Deluge Valve’s seal

faceplate subassembly (#8, Fig. 5). Be sure that

this surface is free of any type of debris. To elimi-

nate leakage due to a water column, refer to the

section in this bulletin marked “Draining Excess/

Condensate Water From System”. If the problem

continues proceed to the following section.

Leakage, air or water from the ball drip valve,

E (Fig. 6):

If system air is leaking out the ball drip valve, the

problem is either damage to the airside of the

Model DDX Deluge Valve’s seal faceplate subas-

sembly (#8, Fig. 5), seat (#29, Fig. 5),or the up-

per seat O-ring (#23, Fig. 5). If supply water is

leaking out the ball drip valve, the problem could

be caused by damage to the Model DDX Deluge

Valve’s seal faceplate sub-assembly (#8, Fig. 5),

seat (#29, Fig. 5), or lower seat O-ring (#24, Fig.

5). The following section provides instructions to

correct both conditions:

Shut down the valve controlling the water sup-

ply to the Deluge Valve and open the 1-1/4”

main drain valve B (Fig. 6). Open the water

column drain valve H (Fig. 6). Close the push

rod chamber supply valve A (Fig. 6) and open

the Model B Manual Emergency Station D

(Fig. 6).

Remove the Deluge Valve’s front (handhold)

cover (#7, Fig. 5) and inspect the seat (#29,

Fig. 5), clapper (#6, Fig. 5),and seal faceplate

subassembly (#8, Fig. 5) for damage.

If inspection indicates damage to the seal

faceplate sub-assembly (#8, Fig. 5), replace

as follows:

Remove the bump stop nut subassembly

(#10, Fig. 5) and remove the seal assembly

(#8, Fig. 5). Install a new seal assembly (#8,

Fig. 5) and thread the bump stop nut (#10,

Fig. 5) onto the threaded stud of the seal sub-

assembly (#8, Fig. 5) and tighten finger tight

plus ¼ to ½ turn.

If inspection indicates damage to the clapper

(#6, Fig. 8) only, then the clapper sub-assem-

bly can be removed as follows:

At the rear of the valve, disconnect the wa-

ter column drain trim section starting with the

elbow connector (#16, Fig. 2). Then remove

the ¼” angle valve (#61, Fig. 2), followed by

the ¾” x ¼” reducing bushing (#7, Fig.2). Re-

move the retaining ring (handhold cover side)

from the clapper hinge pin (#30, Fig. 5) and

push this pin through the water column drain

line and remove the clapper subassembly.

Replace the seal sub-assembly as described

previously. Inspect the clapper (#6, Fig. 5) vi-

sually before reinstalling. Reinstall in the re-

verse order making sure the clapper spacers

are in their proper position. If the seat (#29,

Fig. 5) is damaged or it is suspected that the

leakage is through the lower O-ring (#24, Fig.

5), the seat-clapper subassembly is easily re-

moved as a unit as follows:

Using Reliable P/N 6881603000 Seat Wrench,

remove the seat by unscrewing. This will loos-

en the seat-clapper-mounting ring subassem-

bly. Reach into the valve and grasp the seat-

clapper subassembly and remove it from the

valve. Visually examine all components of

the seat-clapper-mounting ring sub-assembly

replacing any component that appears dam-

aged. New O-rings (#23 & #24, Fig. 5) should

always be used for reassembly.

Reassembly:

Clean the bore of the valve body. Lubricate

the bore with O-ring grease. Lubricate and

install the O-rings (#23 & #24, Fig. 5) onto the

seat. Insert the seat-clapper-mounting ring

sub-assembly into the handhold opening of

the Deluge Valve. Align the mounting ring so

that the Lever (#15, Fig. 5) is near the pushrod

(#25, Fig. 5) and the mounting ring (#5, Fig.

5) “ears” are between the tabs of the valve

body (#1, Fig. 5).Start to tread the seat (#29,

Fig. 5) into the body by hand, then tighten

until the seat (#29, Fig. 5) with seat wrench

6881603000 until it bottoms out on the mount-

ing ring (#5, Fig. 5). Verify that the seat-clap-

per-mounting ring subassembly is in the fully

down position between the tabs of the body,

and check to see that the lever (#15, Fig. 5)

lines up with the push rod (#25, Fig. 5). Loos-

en and reassemble if necessary. Reassemble

the hand hold cover (#7, Fig. 5) and set up

the Model DDX Deluge Valve as per the sec-

tion “Resetting Model DDX Deluge Valve Sys-

tems.”

Leakage out of the push rod chamber vent hole:

A small bleed hole is located on the underside of the

push rod chamber (see Fig. 5). If there is air or water

leakage coming out of this hole, do the following: