User Manual

SERVICE SUGGESTIONS
UPPER (SPRING) SECTION
SYMPTOM PROBABLE CAUSE REMEDY
Vent leaks in Diaphragm (14) damaged Replace diaphragm
lower cover (17) Diaphragm nut (12) loose Tighten nut (12)
O-ring (20) damaged Replace O-ring (20)
Leakage past stem O-ring (10) damaged Replace O-ring
stem (5)
Stem (5) move- *Sand or silt in sensing Remove foreign matter
ment restricted chamber above from sensing chamber
or erratic diaphragm
Sensing line clogged Clean line
Sensing line valve closed Open valve fully
Sensing line sagging or Straighten and
bent collecting sediment support sensing line
to reservoir
Sensing line has high Straighten sensing line.
point trapping air in Must slope upward
the line from altitude control
to the reservoir
*NOTE: if this problem occurs, a sand trap should be
installed in the sensing line, or the line moved to a point
on the reservoir where sand or silt cannot enter this line.
SERVICE SUGGESTIONS
LOWER (PILOT VALVE) SECTION
SYMPTOM PROBABLE CAUSE REMEDY
Vent in lower O-ring (20) worn or Replace O-ring (20)
cover (17) leaks damaged. See Upper Spring
Section service suggestion
Flow from supply Clogged strainer screen(25) Remove screen and
port to clean
valve cover port Silt packed in seat (24) Clear area of blockage
restricted and lower stem (21)
Continuous Seat (24) damaged Inspect and replace
drain leak. Main
valve closed Disc in poppet assembly Inspect and replace
(22) damaged poppet assembly
(22)
Foreign object between Remove object
disc and seat (24)
O-ring (20) in poppet Replace O-ring
guide (28) damaged
Continuous Main valve Service main
drain leak. diaphragm worn valve. Replace
Main valve or stem nut loose diaphragm or
open tighten stem nut
5. Thread and securely fasten poppet guide assembly into lower cover
(recommended 200-250 in/lbs.)
6. Turnover lower cover, and assemble as an assembly lower stem
(21) retainer (18) and spring (19) into lower cover, being careful not
damage o-ring (20).
COMPLETING ASSEMBLY
1. Reassembly of twelve nuts (33) and bolts (32) should be torqued to
200-250 in/lbs. Note: assembly contains two longer bolts (item 32)
for the support bracket. These two bolts are to be assembled with
bracket (29) on the two larger support flats located on the lower
cover located 90 degrees from common/supply ports.
3. Install CDS6 Altitude Control assembly on main valve.
4. Replace tube lines and fittings exactly as removed.
5. Remove upper cover (13) from lower assembly, and push stem
assembly through.
6. Remove diaphragm washer nut (12), diaphragm nut washer (16) and
diaphragm (14)
7. Separate upper stem from diaphragm washer by removing stem
retaining pin. (11)
8. Inspect all parts for damage, wear and mineral deposits.
Check O-ring (10) for wear, inspect and remove any deposit in O-ring
area. Also inspect diaphragm for wear or cracks. Clean parts
thoroughly and replace damaged parts as necessary. If, upon
disassembly, sand and silt are found in the CDS6 Altitude Control,
every effort must be made to eliminate this problem. Filters, or
relocating the reservoir sensing line may be required if deposits are
found in the sensing chamber of the control.
REASSEMBLY OF UPPER SPRING ASSEMBLY
1. Reassembly is in general, the reverse of disassembly. NOTE: A light
coating of Dow Corning 33 grease, or equivalent, should be applied
to CDS6 Altitude Control stems (5), before reassembly.
2. When replacing adjusting nut (4) tighten the same number of
turns as referred to in note in paragraph (1) of "Disassembly Of
Upper Spring Section".
DISASSEMBLY OF LOWER PILOT VALVE SECTION
1. Disassemble control per steps 1 through 5 in "Disassembly of upper
section", to work on lower (pilot) cover (17)
2. Remove lower stem (21) spring (19) and retaining ring (18) as an
assembly, inspect stem for damage.
3. Remove Poppet guide (28) and o-ring (27) from lower cover (17).
4. Remove Poppet (22-1) and poppet spring (26) and inspect poppet
and disc for damage.
5. Remove Strainer screen (25)
6. Remove seat (24), Note: be sure not to nick or ding exposed sealing
surface. To prevent binding and damage, use a wood dowel to
evenly tap out the seat from TOP of lower cover (area from which
lower stem was removed).
7. Inspect all parts for damage, wear and mineral deposits. If there
has been discharge from vent hole, remove o-ring (20) from lower
cover (17) and poppet guide (28). Inspect o-rings for wear or
damage and o-ring groove for material build-up. Clean and/or
replace as necessary. Inspect seat (24) and disc poppet assembly
(22) for wear or damage. If poppet and/or disc are damaged they
must be replaced as an assembly (item 22). Otherwise clean and
polish surfaces of moving parts with 600 wet/dry sandpaper. Also
clean strainer screen (25) of any deposits
REASSEMBLY OF LOWER PILOT VALVE SECTION
1. Reassembly is in general, the reversal of disassembly. Note: A light
coating of Dow Corning 33 grease, or equivalent should be applied
to all o-rings and moving part surfaces (20,21,22-1 23 and 27).
2. Lay lower cover (17) on its top (do not damage serrated surface),
insert the seat (24) with o-ring (23) in lower (pilot) cover with finger.
Use a wood dowel to push the seat in fully with hand pressure
ONLY. Note: damage to the seat can compromise the sealing
ability of the control, and careful efforts must be applied on
reassembly of this component.
3. Insert strainer (25).
4. Install poppet guide, o-ring, spring and poppet assembly.
(See Note #1 for greasing)
CLA-VAL
Copyright Cla-Val 2008 Printed in USA Specifications subject to change without notice.
P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com
©
N-CDS6 (R-6/08)