CSA SCF User manual

CSA products for waste water
Combination air valve
Mod. SCF

CSA air valve Mod. SCF
2
Introduction
This manual will provide you with the information to properly install and maintain CSA Mod. SCF
waste water air valve. They are for use by personnel who are responsible for installation, operation
and maintenance of CSA Air/Vacuum valves.
Safety Messages
All safety messages in the instruction manual are flagged with the following symbol meaning
danger, caution and warning. This means and makes reference to procedures that may lead to
equipment and system damage and to severe injury or death for the personnel involved.
Inspection
Your CSA waste water air valve has been packaged to provide protection during shipment;
however, it can be damaged in transport. Carefully inspect the unit for damage upon arrival and file
a claim with the carrier if damage is apparent.
Parts
Recommended spare parts are listed on the assembly drawing. These parts should be stocked to
minimize downtime. Order parts from your local CSA sales representative if available, or directly
from CSA. When ordering parts, please include the model, type and numbers located on the data
plate placed on the valve. Also include the part name, the assembly drawing number, and the
quantity stated on the assembly drawing.
CSA Service
CSA service personnel are available to maintain and repair all CSA products. CSA also offers
customized training programs and consultation services.
For more information, contact your local CSA sales representative if available, or directly CSA. Visit
our website at www.csasrl.it.
Personnel involved in the installation or maintenance of valves should always be alert to potential
emission of water and pipeline material, and take the necessary safety precautions. Always wear
the suitable protection like helmets, gloves, googles, when dealing and handling hazardous
pipelines and valves.

CSA air valve Mod. SCF
3
Contents
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Handling and Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Fusion/Powder Coated Valves - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
Drawing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Guarantee - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

CSA air valve Mod. SCF
4
Description
The CSA SCF combination wastewater air valve is designed to allow the entrance of large volumes
of air in case of negative pressure conditions, caused for example by pump failure, burst, draining,
and the discharge of large volumes during filling. During working conditions, the air release system
will purge our air pockets accumulating inside the valve.
This type of air valve should not be considered as relief for shock conditions and water hammer
events, which develop elsewhere in the system, for which other and different CSA models and
solutions are available.
The maximum and minimum pressure are stated in the order and according to technical literature.
In general, we recommend to ensure at least 0,3 bar acting on the air valve drain port to ensure the
perfect sealing during working conditions.
Handling and Storage
Lifting the valve improperly may damage it. Lift the valve with slings, chains or cables fastened
around the valve body, or fastened to eyebolts if present or bolts or rods through bolt holes in the
flanges. If installation will be delayed, place valve indoors in secure, weather tight storage. If
temporary outside storage is unavoidable, make sure a vermin proof rain cover is secured
around/over the valve to keep off rain and mud. Skid and set the assembly on a flat, solid, and well
drained surface for protection from ground moisture, runoff and pooled rain water. Do not leave the
valve exposed to high humidity and excessive temperature conditions.
Fusion/Powder Coated Valves
Personnel involved in the installation or maintenance of valves should be constantly alert to
possible damages caused by an improper handling of the valve.
Valves with fusion/powder coated exterior paint require flat washers to be installed under the
flange nuts when installing the valve to the pipeline flange to prevent the paint from cracking or
chipping.

CSA air valve Mod. SCF
5
Installation
The water combination air valve should always be installed in a vertical position, a maximum of 4°
tilt is allowed. An isolation valve between this unit and the transmission (pipeline) system is
necessary to allow maintenance and valve’s inspection. Where to use:
High points in pipelines where the hydraulic gradient and flow conditions are such that a
negative pressure can possibly occur.
Change in slope descending and ascending
Adjacent to any sectioning valve in a pipeline such as a check or gate valve where vacuum
can occur upon closure.
This air valve is not to be installed near pump, where different models part of CSA range
namely anti-hammer air valves has to be used.
Note to Engineer: If installed inside a pump house, use threaded or flanged connections
and pipe back into the well or to outside. This will greatly muffle the high
noise level caused by the air being discharged and provide for drainage
of any small amount of water or water vapour that may accumulate. Same
thing applies in case of possible flood events to the installation chamber
to avoid the entrance of liquid back into the main line.
Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from
the pipeline.
Prepare pipe ends and install valves in accordance with the pipe manufacturer’s instructions
for the joint used.
Tighten the flange bolts or studs in a crisscross pattern and minimum of four stages.
Due to the high capacity in terms of flow rate of SCF possible and unexpected rapid filling
and transient events may cause the liquid to reach high levels inside the air valve, before
stabilizing to the safety required value. Should that happen possible residuals and dirt may
remain trapped on top and the air valve must be cleaned to avoid potential leakages.
If the system is not protected by surge tanks and exposed to rapid filling events CSA anti
hammer SCF RFP type and / or SCF AS anti shock are advised
Besides transients the tolerance of suspended solids, possible fibres, grease balls must be
consistent with the air valve DN where special version with increased spacing between float
and body are available.

CSA air valve Mod. SCF
6
Maintenance
The combination wastewater air valve SCF is automatic in operation and requires very little
maintenance. It should always be installed in a vertical position with a maximum tilt within 4°.
A semi-annual visual inspection for leakage is recommended as well as a check of the O-rings on
the seat (ref picture on page 7). A malfunction of the air valve can be identified by the seepage of
water through the main seat and through the nozzle. Should a malfunction occur, the following steps
should be taken to repair the valve;
Disassembly Procedure
See Figures 1 on page 6 for part identification.
1. Relieve pipeline pressure or shut off isolation valve before servicing the Air Valve.
2. Slowly remove the drain port (18) to relieve internal pressure
3. Remove nuts (16), cap (3), nuts and washers (19 and 17) and extract the seat (14)
4. Inspect the sealing surface of the seat and check whether gaskets (12) and (13) are torn or
damaged
5. Remove nuts and washers (21 and 22) and pull up the upper part (2)
6. Pushing from beneath the float (4) rise it and inspect the obturator flat (11) for possible dirt and
torn out surfaces
7. The air release system (9 and 10) is placed between the end of the shaft and the obturator.
Normally it doesn’t have to be maintained and kept as a separate spare part. Simply unscrew the
obturator (11) keeping the float shaft (5) firmly secured from the hexagonal part (not holding it by
the float)
8. Inspect and clean the surface and opening of the air release nozzle (10) and clean it by means
of water or, compressed air. Be careful not to lose the O-ring between it and the obturator (11)
assuring the water tightness
9. When handling the float and its shaft (4 and 5) be aware not to bend it or deform, also check the
float surface, shape, and make sure not sign of wear, corrosion and buckling are present (possibly
due to water hammer events)
10. Be sure to leave the plane gasket between the gasket holder and the upper part in DI
11. Check the proper movement of the float, pushing it up and down through the guide (7) and make
sure no sign of friction or obstacles are present
12. The float is also guided by 4 ribs present in the lower body (1)
13. Inspect all connections of linkage for excessive wear.
14. Clean all surfaces before re-assembly.
Servicing the Air/Vacuum Valve while the pipeline is under pressure can cause personal injury or
equipment damage. Relieve pipeline pressure or shut off isolation valve before servicing the
Air/Vacuum Valve.
Do not completely remove pipe plug or cover screws while the valve is under pressure.

CSA air valve Mod. SCF
7
Drawing
 


1
4
18
21
22
65
10
17
19
15
16
23
7
3
12
14
13
20
11
9
8
2
24
25
26
SCF DN50/65 cap
N.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Component
Lower body
Upper body
Cap
Float
Float shaft
O-ring
Driving sleeve
Plane gasket
Gasket holder
Nozzle subset
Obturator flat
Seat gasket
O-ring
Seat
Studs
Nuts
Washers
Ball valve 1"
Nuts
Studs
Nuts
Washers
Plug
Threaded elbow
Fitting
Exhaust air control gasket
Material
GJS 500-7/GJS 450-10
GJS 500-7/GJS 450-10
GJS 500-7/GJS 450-10
AISI 316
AISI 316
NBR/EPDM/Viton/Silicone
AISI 303/AISI 316
NBR
AISI 316
AISI 316
Polypropylene
NBR/EPDM/Viton/Silicone
NBR/EPDM/Viton/Silicone
AISI 304 (303 for DN50/65)/AISI 316
AISI 304/AISI 316
AISI 304/AISI 316
AISI 304/AISI 316
AISI 316
AISI 304/AISI 316
AISI 304/AISI 316
AISI 304/AISI 316
AISI 304/AISI 316
Brass/AISI 316
Polypropylene
Polypropylene
NBR
Spare parts: 4/5-6-9-10-12-13-26

CSA air valve Mod. SCF
8
Troubleshooting (ref. drawing 1 on page 7)
Condition Possible Cause Corrective Action
Valve leaks at flange joint.
Loose flange bolting. Tighten flange bolting.
Blown flange gasket. Replace flange gasket.
Miss-alignment or damage to
field piping and supports.
Adjust miss-alignment or repair
piping or supports.
Damaged flange face/s or
improper flange connections.
Repair flange, replace valve
body or adjust flange
connections.
Valve leaks out of the main
sealing seat (14).
Valve is not vertical Place the valve in a vertical
position
Possible corrosion through
the body and seat
Check the fluid chemicals
parameters and contact CSA
Dirty seat and/or upper float Clean seat and/or float.
Worn seat and/or float. Replace seat and/or float.
Line pressure is under 0,3 bar Replace seat with softer seat.
Worn O-ring between seat
and body Inspect and replace O-ring
Valve leaks out of the air
release subset (9 and 10)
Valve is not vertical Place the valve in a vertical
position
Possible corrosion through
the air release subset
Check the fluid chemicals
parameters and contact CSA
Dirt accumulated on the air
release subset (9 and 10)
Inspect and clean the air release
subset, replace if necessary
Line pressure is under 0,3 Replace seat with softer seat.

CSA air valve Mod. SCF
9
Guarantee
Products, auxiliaries and parts thereof of CSA Srl manufacture are warranted to the original purchaser for a
period of twelve (12) months from date of shipment from factory, against defective workmanship and material,
but only if properly installed, operated and serviced in accordance with CSA Srl recommendations. Repair or
replacement, at our option, for items of CSA Srl manufacture will be made free of charge, (FOB) our facility
with removal, transportation and installation at your cost, if proved to be defective within such time, and this is
your sole remedy with respect to such products. No claim for transportation, labor or special or consequential
damages or any other loss, cost or damage shall be allowed. You shall be solely responsible for determining
suitability for use and in no event shall CSA Srl. be liable in this respect. CSA Srl does not guarantee resistance
to corrosion, erosion, abrasion or other sources of failure, nor does CSA Srl guarantee a minimum length of
service. Your failure to give written notice to us of any alleged defect under this warranty within twenty (20)
days of its discovery, or attempts by someone other than CSA Srl. or its authorized representatives to remedy
the alleged defects therein, or failure to return product or parts for repair or replacement as herein provided,
or failure to install and operate said products and parts according to instructions furnished by CSA Srl or
misuse, modification, abuse or alteration of such product, accident, fire, flood or other Act of God, or failure to
pay entire contract price when due shall be a waiver by you of all rights under this warranty.
The foregoing guarantee shall be null and void if, after shipment from our factory, the item is modified in any
way or a component of another manufacturer, such as but not limited to, an actuator is attached to the item by
anyone other than CSA Srl. factory Service personnel. All orders accepted shall be deemed accepted subject
to CSA Srl warranty terms and conditions.
Limitation of liability
LIMITATION OF LIABILITY: IN NO EVENT SHALL CSA Srl BE LIABLE FOR ANY DIRECT, INDIRECT,
SPECIAL OR CONSEQUENTIAL DAMAGES WHATSOEVER, AND CSA Srl LIABILITY, UNDER NO
CIRCUMSTANCES, WILL EXCEED THE CONTRACT PRICE FOR THE GOODS AND/OR SERVICES FOR
WHICH LIABILITY IS CLAIMED. ANY ACTION BY YOU FOR BREACH OF CONTRACT MUST BE
COMMENCED WITHIN 12 MONTHS AFTER THE DATE OF SALE.
Sales and Service
For information about our service, approvals, certifications:
Web site: www.csasrl.it E-Mail: [email protected]
CSA Srl Inc. reserves the right to incorporate our latest design and material changes without notice or obligation.
Design features, materials of construction and dimensional data, as described in this manual, are provided for your information only.
4/2021