Asco 8344 Series Installation And Maintenance Instructions

Installation & Maintenance Instructions
1/4I, 3/8I, 1/2I, 3/4I, OR 1I NPT - 1/4I, 3/8I, OR 3/4I ORIFICE
SINGLE SOLENOID - AIR OR INERT GAS SERVICE
IMPORTANT: See Installation and Maintenance Instructions, Form No. V6862 for exploded isometric views.
IMPORTANT: See separate solenoid installation and
maintenance instructions for information on: Wiring,
Solenoid temperature, Causes of Improper Operation, Coil or
Solenoid Replacement.

DESCRIPTION

Series 8344 valves are heavy duty, 2-position, 4-way valves
with poppet type seats and discs to provide tight seating. The
main valve discs are power driven in both directions by line
pressure. No return springs are required. The valves are made
of forged brass with stainless steel, brass, and copper internal
parts; elastomers are Buna N. The valves may be provided with
a low power or intrinsically safe solenoid.

OPERATION

Solenoid De-energized: Flow is from Pressure P to Cylinder B
and from Cylinder A to Exhaust E. Slight pilot exhaust is also
apparent.
Solenoid Energized: Flow is from Pressure P to Cylinder A and
from Cylinder B to Exhaust E.
IMPORTANT: Minimum operating pressure differential is 10
psi.
Flow Diagrams
De-energized
Cyl. B Cyl. A
Pilot
Exh.
Press. Exh.
P E

INSTALLATION

Check nameplate for correct catalog number, pressure,
voltage, frequency, and service. Never apply incompatible
fluids or exceed pressure rating of the valve. Installation and
valve maintenance to be performed by qualified personnel.
Temperature Limitation
Fluid and ambient temperature range: -4_F to +140_F.
Future Service Considerations
Provision should be made for performing seat leakage, external
leakage, and operational tests on the valve with a
nonhazardous, noncombustible fluid after disassembly and
reassembly.
e
ASCO Valves
2-POSITION, 4-WAY SOLENOID VALVES
Energized
Cyl. B Cyl. A
Pilot
Exh.
Press. Exh.
P E
MCMXCIII All Rights Reserved.

Positioning

Valve may be mounted in any position.

Mounting

For mounting valve refer to Figure 1.
Pipe
Length L "*
Size
NPT Inches mm Inches
1/4I 1 7/8 47,6 2 13/32
3/8I
2 5/8 2 5/8 66,6 66 6
1/2I
3/4I
3 7/8 3 7/8 98,4 98 4 3 13/16 3 13/16
1I
Figure 1. Series 8344 valve body mounting dimensions.

Piping

There is pilot exhaust from the top of the solenoid when the
valve is in the de-energized mode. The pilot exhaust may be
connected to the main exhaust if the air or inert gas cannot be
exhausted directly to the atmosphere. Connect piping or tubing
to valve according to markings on valve body. Refer to flow
diagrams in OPERATION section.
CAUTION: To avoid damage or accidental disengagement
of cartridge assembly from valve body, hold cartridge assembly
securely by wrenching flats when installing or removing piping
at top of solenoid.
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 solenoid as a lever. Locate wrenches applied
to valve body or piping as close 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 (10 psi), 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.
Printed in U.S.A.
50-60 Hanover Road, Florham Park, New Jersey 07932
SERIES
8344
Form No. V6861R1
Holes D"*
Width W" *
Dia. ∅
mm Inches
61,1 9/32
3 1/8 3 1/8 79 3 79,3 11/32 11/32
96 8 96,8 11/32 11/32
Page 1 of 4
mm
7,1
8,7 8 7
8,7 8 7