Cla-Val CDS6-A User Manual

INTRODUCTION

The Cla-Val Model CDS6 Altitude Control is a spring loaded, 3-way,
diaphragm-actuated control that provides high-level shut-off for Cla-Val
Altitude Control Valves. It remotely senses pressure in the reservoir or
tank. There are five altitude ranges available, 5 to 40 feet, 30 to 80 feet,
70 to 120 feet, 110 to 160 feet and 150 to 200 feet. The spring adjusting
nut can be set to stop flow into the reservoir within these ranges.

INSTALLATION

The CDS6 Altitude Pilot Control is normally supplied mounted on a
Cla-Val 210 Series Altitude Valve which should be installed in a horizon­tal run of pipe with the main valve cover up. Two line block valves are
recommended for valve servicing. If the CDS6 is mounted from the main
valve by a few feet, then it must be installed with adjustment springs up
for ease of adjustment and servicing. Consult factory for recommenda­tions.

After the Cla-Val 210 Series Altitude Valve is installed in the pipeline
close to the reservoir, install the required remote sensing line from the
CDS6 to the reservoir or tank. The sensing line allows the CDS6 to
sense the static pressure head of the reservoir. The sensing line should
not be installed in the flowing line between the valve and the reservoir or
into turbulent flow area. These locations do not reflect the true static
head of the reservoir.

INSTALLATION / OPERATION / MAINTENANCE

MODEL

CDS6

ALTITUDE CONTROL

The remote sensing line should be 3/4" or larger copper tubing or
Schedule 40 PVC pipe. Galvanized pipe is not recommended. The sens­ing line should slope (minimum 2 degrees) upward from the CDS6
toward the reservoir to self -purge air out of the line. The sensing line
should have no high points to entrap air. A shutoff valve at the reservoir
connection is recommended. For above ground reservoirs, the connect­ing point for the sensing line should be a minimum of 12" to 18" above
reservoir bottom (if filling from bottom) or at fill pipe connection (if filling
from side). Minimum high-level set-point adjustment is approximately
five feet above the remote sensing point of connection.

Note: Please make sure to remove the plastic plug from the drain port
before putting the valve in service if pilot drains to atmosphere.

CDS6 STOCK

NUMBER

2" SIZE

29330-06F
29330-07H
29330-08K
29330-09B
29330-10D

CDS6 STOCK

NUMBER

2 1/2" SIZE &

LARGER
29330-01E
29330-02G
29330-03J
29330-04A
29330-05D

ALTITUDE

RANGE
(FT H

20)

5 - 40

30 - 80

70 - 120
110 - 160
150 - 200

NUMBER

OF

SPRINGS

1
2
3
4
5

PSI

CHANGE

PER TURN

0.32

0.64

0.96

1.28

1.60

ALTITUDE

CHANGE

PER TURN

0.75

1.50

2.20

3.00

3.70

OPERATION, START-UP AND ADJUSTMENT

When the reservoir pressure (head) is lower than the setpoint of the
spring on the CDS6 Altitude Control ports "1" and "D" are interconnect­ed. This relieves the main valve cover pressure to atmosphere. Line
pressure then opens the main valve to start filling the reservoir.
Reservoir sensing pressure increases as the liquid level rises in the
reservoir. When the sensing pressure increases to the set point of the
CDS6 control spring, the control shifts interconnecting port "S" and port "1".
This pressurizes the main valve cover chamber and the main valve closes.

By turning the adjusting nut the liquid level shutoff point will be changed.
Turn the adjusting nut clockwise to raise the liquid level shutoff point;
counterclockwise to lower the liquid level shutoff point. Follow the gen­eral operation and start-up instructions regarding purging air from the
valve control system.

MAINTENANCE AND INSPECTION

Under normal operating conditions the CDS6 Altitude Control will be
trouble free. There is a visual check possible to determine if there is
damage to the diaphragm in the control. The Lower Cover/Pilot (a) is
vented to atmosphere by means of a small hole in the wall of the cast­ing. If water is discharging out of this opening, the diaphragm should be
inspected for damage.

One other visual check and indication of a problem is continuous dis­charge from the drain port ("D") at the bottom of the CDS6.

The volume of drained water will vary according to the valve size.
Continuous draining after main valve has fully opened will indicate a
problem. Refer to the service suggestions to check for probable causes
and remedies.

DISASSEMBLY

During preventive maintenance or service to the CDS6 Altitude Control,
all pressure to the control must be shutoff. The CK2 shutoff cocks in the
main valve control lines should be closed before starting disassembly.
Main valves 4" and larger have CK2 cocks installed, however main
valves smaller than 4" normally do not, therefore requiring closure of
shutoff valves in the main line at the valve inlet and outlet. The shutoff
cock or valve in the sensing line to the reservoir must also be closed.

WARNING: Failure to shutoff and release pressure prior to any

disassembly can result in serious damage to equipment or
injury to personnel.

1. Disconnect tubing at the CDS6 Altitude Control.

2. Remove two mounting caps screws and two lock washers.

3. Remove CDS6 Altitude Control from main valve to work bench or
clean area. Parts must be kept clean.

DISASSEMBLY OF UPPER SPRING SECTION

1. Unscrew adjusting nut (4) from upper stem (5).
NOTE: Count the number of turns required to remove the nut (4),
record this information for reference when reassembling.
The CDS6 Altitude Control can then be approximately reset for the
same reservoir liquid level shut-off point.

2. Remove the thrust washer (3), swivel retainer (2) and spring
retainers if applicable.

3. Remove Spring(s) (6), bellows (7) and set-screw (8)

4. Remove twelve hex nuts (33), and twelve bolts (32), and set
mounting bracket (29) aside.

Note: Assembly contains two (of twelve) longer bolts

which are used for the mounting bracket.

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)

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.

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

CLA-VAL

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

Copyright Cla-Val 2008 Printed in USA Specifications subject to change without notice.

N-CDS6 (R-6/08)