SERVICE MANUAL
1
RETAINER, Spring
17
O-RING
2
RING, Retaining
18
RING, Retaining
3
RING, Retaining
19
O-RING
4
BODY, Valve (Primary)
20
SPRING
5
O-RING
21
BODY, Valve (Secondary)
6
RING, Reaction
22
SPRING
7
SPRING
23
PISTON, Secondary
8
RETAINER, Seal
24
O-RING
9
BODY, Exhaust Valve
25
TAG, Name
10
O-RING
26
RING, Retaining
11
O-RING
27
O-RING
12
BODY, Exhaust Valve
28
SCREW
13
DIAPHRAGM
29
VALVE AND SEAL
14
SCREW
30
SHIM
15
RETAINER. Washer
31
PISTON, Primary
16
VALVE AND SEAL
32
COMPENSATOR, Spring
assembly (8 and 16) to move away from the inlet seat of
valve body (21) allowing the secondary reservoir
pressure "J" to enter cavity "H" and flow out the
secondary delivery port.
Release of Primary Section
When force is removed from the foot valve actuator
(treadle or pedal), force is removed from the spring
retainer (1), compensating spring (32) and the primary
piston (31). The primary piston moves upward due to air
pressure in cavity "A" and a force of return spring (7).
This allows the rubber face seal (29) to seat against
valve
body (4) and causes the primary piston exhaust seat "B"
to move away from the rubber face of seal (29). This
allows primary delivery air pressure to exhaust through
cavity "C" and "K" out to atmosphere around the exhaust
port diaphragm(13).
Release of Secondary Section
When air pressure is exhausted from primary delivery
section, air pressure is also exhausted from the bleed
hole "E" and cavity "F." The secondary piston (23) moves
upward due to air pressure in cavity "H" and a force of
the return
CTS-4079 - CHAPTER - Page 12