Cla-Val 37 Series - Manual

36
• Stainless Steel T316 Trim Standard
• Stainless Steel T316 Floats Guaranteed
• Air Throttling Device (Double Port)
• Arrestor Check Device (Anti-Shock)
• 100% Vacuum Protection - No Restrictions
• Engineered For Drip Tight Seal At Low Pressures
Series 37 Well Service Air Valves regulate air discharge from the
pump column to prevent shock and air entering the system with
each start. Conversely with each pump stop, full flow unrestricted
air, is allowed back into the column preventing vacuum forming,
which can damage pump steals, but also to prevent the pump
restarting against a full head in the column because vacuum will
prevent the pump column to drain. Under this condition severe
damage to the pump, controls and piping can occur.
All the preceding is accomplished by means of a unique air throt-
tling device (double port) and an arrestor check with built in anti-
shock feature.
Well service air vacuum valves, once closed and pressured do not
open to air release under pressure.
See series 34 Air Release Valves page 5.
Installation
The Series 37 Well Service Valve is typically installed between
the pump discharge and check valve. Mount the unit in the
vertical position on top of the pipeline with an isolation valve
installed below the valve in the event servicing is required.
Provide adequate air venting inside the pump station and from
air valve vaults on pipelines.
Design / Purchase Specifications
The Well service air valves shall automatically exhaust large
quantities of air in the pump column during pump start-up
and allow air to re-enter the column during pump shut-down.
The air valve shall be designed for installation between out-
let of vertical turbine pumps and the inlet of the pump check
valve.
The inlet and outlet area of the air valve shall be equivalent
to the valve pipe size same cross-section area. The valve
shall have NPT Threaded or ANSI Flanged inlet and outlet.
The float shall be guided by a hexagonal stainless steel
guide shaft and seal drip-tight against a synthetic rubber
seal. 4" and larger valve float shall be double guided and a
protective steel discharge hood provided.
The float shall be of all stainless steel construction and
capable of withstanding maximum system surge pressure
without failure. The body and cover shall be concentrically
located and of cast iron and the valve all internal parts shall
be T316 stainless steel with Buna-N
® rubber seat.
1/2”, 1”, 2” and 3” Well Service Air Valves to be supplied with
a double ported throttling device to regulate the discharge of
air from the pump column to prevent shock to the pump with
each start. 4” and larger well service valves to be supplied
with an arrestor check to prevent shock to the pump with
each pump start. All Well Service Air Valves shall allow full
un-restricted air flow into the pump column, to
prevent any vacuum from forming, with each
pump stop.
General Specifications
Sizes
1/2", 1", 2", 3" Threaded Inlet
with double port throttling device
4" through 16"
125 lb. flanged Inlet or
250 lb. flanged Inlet
with arrestor check
Pressure Ratings
150 psi
300 psi
specify when operating pressure
below 10 PSI
Temperature Range
Water to 180°F
Materials:
Body and Cover:
Cast Iron ASTM
A 126, Class B
Float:
Stainless Steel T316
Air Valve Internal Parts:
Stainless Steel T316
Arrestor Check:
Stainless/Bronze
Seal:
Buna-N ® Rubber
AIR AND VACUUM VALVES FOR
VERTICAL TURBINE (WELL SERVICE)
PUMP STATIONS AND PIPELINE SERVICE
1/2" - 3" 4" and Larger