Ashcroft 1327D - Pressure Gauge Comparator - Manual (Page 13)

d. Unscrew shuttle valve plug (43) and remove O-ring
packing (27).
e. Remove check valve spring (14) and check valve (44).
f. Remove O-ring packing (15) from check valve (44).
5.7 Removing Bleeder Valve and Check Valve Assembly
a. Unscrew bleeder valve (51)
b. Unscrew bleed plug (50) and remove O-ring packing
(27).
c. Remove valve spacer (29) check valve spring (14)
and check valve (44).
d. Remove O-ring (15) from check valve (44).
5.8 Removing High Pressure Check Valve
a. Unscrew plug (28) and remove O-ring packing (27).
b. Unscrew adjusting screw (26).
c. Remove guide rod (13), check valve spring (14), and
check valve (44).
d. Remove O-ring packing (15) from check valve (44).
5.9 Removing Release Valve
a. Remove release valve assembly (37) and O-ring
packing (27)
b. Disassemble valve assembly by rotating handle
counter-clockwise until valve stem is free from valve
body.
c. Remove O-ring packing from valve stem.
d. Remove screw (38) and seal (39) by turning counter-
clockwise.
e. Remove O-ring packing (40).
5.10 Removing Displacement Valve
a. Remove displacement valve assembly (41).
b. Remove O-ring packing (27).
c. Remove handle from stem by rotating handle counter-
clockwise. This is not required for normal cleaning.
d. Rotate the stem clockwise (using screwdriver in the
slot at the top of the stem) until it is free from body.
e. Remove nut back-up washers and ring packing from
stem.
5.11 Stem Body from Drip Pan
a. Take out three bolts (25). This is not required for
normal cleaning.
b. Remove body assembly (2) from drip pan (3). This is
not required for normal cleaning.
5.12 Inspection
Visually inspect these parts for wear, damage, chips,
cracks and stripped threads:
Body Assembly Threads
Piston
Piston Sleeve (6)
Displacement Stem and Mating Surface in Body
Back-up Washers
Moving O-ring Packings
Dead Weights
Piston and Cylinder Assembly – 1305D
Test Gauges – 1327D
Back-up washers must fit snugly into piston sleeve and
into displacement valve body. Then check static (non-mov-
ing) packing for pinch marks, tearing or extrusion. Check
all valve seats for scratches and roughness.
Replace all worn or damaged parts. Replace all O-ring
packings at each overhaul. Coat O-ring packings with suit-
able lubricant before replacing, to prevent sticking and
tearing during assembly and tightening of connections.
5.13 Reassembly
When reassembling, use where possible the wrenches
supplied with the equipment. These wrenches permit
enough leverage to seal all connections. Excessive tight-
ening of parts with tools other than those supplied may
cause distortion and eventual failure of threaded portions
of the tester body assembly casting. When replacing O-
ring packings, coat them with suitable lubricant to prevent
sticking and tearing during assembly and tightening of
connection.
5.14 To Reassemble
Body assembly on drip pans.
Replace body assembly (2) on drip pan (3) using bolts (25).
5.15 Replacing Displacement Valve
a. Place O-ring packing between back-up washers.
b. Attach back-up washers and O-ring packing to dis
placement valve stem with nut.
c. Thread stem into body from the bottom – use screw
driver in the slot at top of stem.
d. Screw stem through body until the back-up washers,
and O-ring packing are fully enclosed in the body.
CAUTION: Do not damage O-ring packing when
threading stem through body.
e. Screw handle onto stem.
f. Replace displacement valve assembly (41) with
O-ring packing (27) in body assembly (2).
5.16 Replacing Release Valve
a. Place O-ring packing (40) in body casting (2) hole.
b. Insert seat (39) into body casting hole.
c. Thread & tighten screw (38) into body casting hole.
CAUTION: Be sure that stem of seat (39) fits into
screw hole.
d. Place O-ring packing on valve stem.
e. Screw handle onto valve stem.
f. Screw valve stem into body until end of stem does not
extend beyond valve body.
CAUTION: Do not damage O-ring packing when
threading valve stem through valve body.
g. Replace O-ring packing (27).
h. Replace release valve assembly (37) in body
assembly (2).
5.17 Replacing High Pressure Check Valve
a. Place O-ring packing (15) on check valve (44).
b. Slide check valve (44), check valve spring (14), and
guide rod (13) into body assembly (2).
c. Replace adjusting screw (26) and screw it in until it
stops.
d. Then turn (26) back two complete revolutions.
e. Replace plug (28) with O-ring packing (27) in body
assembly (2).
5.18 Replacing Bleeder Valve and Check
Valve Assembly
a. Replace O-ring packing (15) on check valve (44).
b. Slide check valve (44), check valve spring (14) and
valve space (29) into body assembly (2).
c. Replace bleed plug (50) with O-ring packing (27) into
body assembly (2).
5.19 Replacing Shuttle Valve, Shuttle Valve Plug and
Check Valve
a. Insert shuttle valve piston (3) into body (2).
b. Slide shuttle pin (31) into 1/8 inch (3mm) diameter
opening adjacent to fill tube (23) port. Apply slight
inserting pressure to shuttle pin (31) with plastic shaft
and operating shuttle valve (30) to insure proper
pin engagement.
c. Replace spring (32) directly behind shuttle pin (31)
and secure with set screw (33). Set screw must be
recessed by .050 inch (12mm) minimum.
d. Replace O-ring packing (15) on check valve (44).