DeZURIK
APCO AVV-140/150 with CSV-1600 Option Slow Closing
Air/Vacuum Valves
D12021
Page 4
June 2019
Description
The APCO Air/Vacuum Valve mounted on top of a Surge Check Valve is designed to eliminate critical
shock conditions occurring in those installations where the operating conditions cause a regular air valve
to slam closed. This slow closing feature protects the Air/Vacuum valve and also prevents the
Air/Vacuum valve from creating a surge in the pipeline by slamming shut.
This type Air/Vacuum Valve with Surge Check Valve should not be considered as relief for shock
conditions which develop elsewhere in the system. However, actual field tests prove the Surge Check
Valve may protect the Air/Vacuum Valve from damage by severe shut-off shock.
Handling and Storage
Lifting the valve improperly may damage it. Do not fasten lifting devices to piping or attached
components. Lift the valve with
slings, chains or cables fastened around the valve body, or fastened to
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 (water shedding tarp, etc.) 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.
Installation
The Air/Vacuum Valve with Surge Check Valve should always be installed in a vertical position. An
isolation valve between this unit and the transmission (pipeline) system is recommended. Where to use:
•
High points in pipelines where the hydraulic gradient and flow conditions are such that a negative
pressure can possibly occur.
•
High points on sections of pipeline having water velocities in excess of 10 F.P.S.
•
Adjacent to any quick closing valve in a pipeline such as a check or gate valve where vacuum
can occur upon closure.
•
On the discharge of larger deep well turbine pumps between the pump and the check valve.
•
If an Air/Vacuum Valve is to be 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 vapor that may accumulate.
•
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 manufacture’s instructions for
the joint used.
•
Tighten the flange bolts or studs in a crisscross pattern and minimum of four stages.