Cla-Val 35 Series - Manual

CLA-VAL
TM
¤
• Provides High Capacity Venting for Pipeline Protection
• Stainless Steel Trim Standard
• Stainless Steel Floats Guaranteed
• Fully Ported Valves - No Restrictions
• Designed For Drip Tight Seal At Low Pressures
The Cla-Val Series 35 Air and Vacuum Valve is designed to perform
two separate functions. First, it will allow large quantities of air to be
exhausted from the pipeline as it is being filled with water. When
this air has been vented completely, water will enter the valve
causing the float to seal tightly against the seat to prevent water
flow. Secondly, if the line is being drained, either intentionally or as
a result of pipeline breakage, the valve responds to the loss in
pressure and opens. This allows air to re-enter the pipeline and
prevents potentially damaging vacuum from developing.
Note: The Series 35 does not open under pressure to exhaust
small quantities of air which may collect at high points during
system normal operation. Series 34 Air Release Valve is required
for this function.
General Specifications
Sizes
1/2", 1", 2", 3" NPT
4" through 16"
125 lb. flanged ANSI Rated
250 lb. flanged ANSI Rated
Pressure Ratings
175 psi
300 psi
Temperature Range
Water to 180°F
Note: Specify when operating
pressure below 10 PSI
Materials
Body and Cover:
Cast Iron ASTM
A 126, Class B
Float:
Stainless Steel
Internal Parts:
Stainless Steel
Seal:
Buna-N® Rubber
Installation
Series 35 Air and Vacuum Valves should be installed at high
points or at grade changes within the pipeline. Mount the unit
in the vertical on top of the pipeline with isolation valve below
each valve in the event servicing is required. A vault with
adequate venting and drainage should also be provided.
Purchase Specification
The air and vacuum valve shall be able to automatically
exhaust large quantities of air during filling of a pipeline and
allows air to re-enter pipeline during the draining or when a
negative pressure occurs.
The inlet and outlet of the air and vacuum valve shall have the
same cross-section area as the pipe size. The float shall be
guided by a stainless steel bottom guide shaft. The 4" and larg-
er valve floats shall have top and bottom guide shafts of
hexagonal cross section and have a protective steel discharge
hood.
The float shall be of all stainless steel construction guaranteed
to withstanding the design system surge pressure without failure.
The body and cover shall be concentrically located and of cast
iron and the valve internal parts shall be of stainless steel with
Buna-N
® rubber seat.
The Air and Vacuum Valve shall be Series 35 from Cla-Val.,
Newport Beach, CA U.S.A
When Ordering, Please Specify:
1. Model Number
2. Inlet Size
3. Inlet Pressure Rating
Optional:
For anti-shock air valve shut-off order with
arrestor check device, order valve with
suffix “AC” see data sheet pages 32 & 33.
Series 35
Air and Vacuum Valves