Page 1 of 4 (Section 1 of 2)
50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com
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E176963
Installation & Maintenance Instructions
SERIES
8344
4-WAY HEAVY DUTY SINGLE SOLENOID VALVES
1/4
I
, 3/8
I
, 1/2
I
, 3/4
I
OR 1
I
NPT
1/4
I
, 3/8
I
OR 3/4
I
ORIFICE
I&M No.V7544 -Sec. 1
(Section 1 of 2)
NOTICE: See separate solenoid installation and
maintenance instructions for information on: Wiring,
Solenoid Temperature, Cause of Improper Operation and
Coil Replacement.
DESCRIPTION
Series 8344 valves are packless, solenoid pilot controlled, heavy duty, 4-way
valves with forged brass valve bodies and poppet type main discs. The main
discs are power driven in both directions by line pressure. No return springs
are required. Valves may be provided with a general purpose/watertight,
open frame, or watertight/explosionproof solenoids.
OPERATION
Solenoid De-Energized:
Flow is from Pressure P to Cylinder A and from
Cylinder B to Exhaust E.
Solenoid Energized:
Flow is from Pressure P to Cylinder B and from Cylinder
A to Exhaust E.
Minimum on time for valve is 0.3 seconds on air service and 1.0 seconds on
liquids
IMPORTANT: Minimum operating pressure differential is 10
psi on air, gas or water and 25 psi on hydraulic oil (300 S.S.U.).
Cyl. A
Cyl. B
Press. Exh.
P
E
Press. Exh.
P
E
Cyl. A
Cyl. B
FLOW DIAGRAM for Single Solenoid
De-Energized
Energized
Manual Operator (optional feature)
Manual operator allows manual operation when desired or during an electrical
power outage. To engage manual operator (open the valve), turn lever clockwise
until it hits a stop. Valve will now be in the same position as when the solenoid
is energized. To disengage manual operator (close the valve) turn lever
counterclockwise until it hits a stop.
CAUTION: For valve to operate electrically, manual
operator lever must be fully rotated counterclockwise.
SPEED/FLOW CONTROL-METERING DEVICE
Speed/flow control valves (2) may be added to allow full unrestricted flow in
one direction and controlled flow in the opposite direction. These valves
must be in the A" and/or B" cylinder piping, between the solenoid valve and
the cylinder.
IMPORTANT: Do not install the speed control or any other
restrictive device in either the pressure (inlet) connection or
the exhaust (outlet) connection of the valve. Restricting either
of these lines may cause valve malfunction.
metering knob stem
locking pawl
bonnet
body gasket
stem gasket
spring
valve body
disc
FREE FLOW
METERED FLOW
INSTALLATION
Check nameplate for correct catalog number, pressure, and service. Never
apply incompatible fluids or exceed pressure rating of the valve. Installation
and valve maintenance to be performed by qualified personnel.
Positioning
This valve is designed to perform properly when mounted in any position.
However, for optimum life and performance, the operator should be
mounted vertically and upright to reduce the possibility of foreign matter
accumulating in the pneumatic operator.
Piping
Connect piping or tubing to valve according to markings on valve body. Refer
to flow diagrams. Apply pipe compound sparingly to male pipe threads only.
If applied to valve threads, the compound may enter the valve and cause
operational difficulty. Avoid pipe strain by properly supporting and aligning
piping. When tightening the pipe, do not use valve or pneumatic operator as
a lever. Locate wrenches applied to valve body or piping as close as possible
to connection point.
To insure proper operation of the valve, the pressure and exhaust lines must
be full area without restriction. A minimum differential pressure as stamped
on the nameplate must be maintained between pressure and exhaust at the
moment of shifting. Air reservoirs must have adequate capacity to maintain
this minimum pressure during shifting. To check pressure during shifting,
install a pressure gauge in the pressure piping as close to the valve as possible.
Power Line
Wiring Diagram for
Single Solenoid
Pressure P"
Exhaust E"
Cylinder B"
Cylinder A"
Location of Metering
Devices when used
Pressure guage
location
Full size piping without
restrictions must be
used on pressure and
exhaust lines.
MAINTENANCE
WARNING: To prevent the possibility of death,
personal injury or property damage, depressurize
valve (main and auxiliary pressure lines), and vent
fluid to a safe area before servicing the valve.
NOTE: It is not necessary to remove the valve body from the pipeline for repairs.
