ASCO Valves 8320 Series

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50 Hanover Road, Florham Park, New Jersey 07932 www.ascovalve.com

Installation & Maintenance Instructions

SERIES

8320

BRASS OR STAINLESS STEEL CONSTRUCTION

I&M No.V7569

3-WAY NORMALLY CLOSED DIRECT MOUNTED SOLENOID VALVES

FOR NAMUR ACTUATORS Ċ 1/4I NPT Ċ AIR OR INERT GAS SERVICE

NOTICE: See separate solenoid installation and maintenance

instructions for information on: Wiring, Solenoid Temperature,

Causes of Improper Operation and Coil or Solenoid Replacement.

DESCRIPTION

Series 8320 valves are 3-way normally closed direct mounted

solenoid valves designed for air or inert gas service. Valves are

made of rugged brass or stainless steel. Series 8320 valves are

provided with a general purpose solenoid enclosure. Series

EE8320 is the same as Series 8320 except it is provided with a Class

I, Division 2 explosionproof/watertight solenoid enclosure.

OPERATION

Normally Closed (Pressure at Port 1)

Solenoid De-energized: Flow is from Port 2 to Port 3. Port 1 is

closed.

Solenoid Energized: Flow is from Port 1 to Port 2. Port 3 is closed.

Breather Function: Allows for spring side of a spring return actuator to

vent at all times through valve exhaust port 3. IMPORTANT: Because

of the breather function, the use of a metering / flow control device at

exhaust port 3 (to control actuator speed) is not recommended.

NOTICE: No minimum operating pressure differential required.

SOLENOID

DE-ENERGIZED

SOLENOID

ENERGIZED

FLOW DIAGRAMS

Manual Operation

Manual operator (optional feature) allows manual operation when

desired or during an electrical power outage. Depending upon valve

requirements, two types of manual operators are available:

Momentary Push Type (Suffix MO) Manual Operator

To engage push type manual operator, push stem at base of valve body

upward as far as possible. Valve will now be in the same position as

when the solenoid is energized. To disengage manual operator,

release stem. Manual operator will return to original position.

Maintained Screw Type (Suffix MS) Manual Operator

To engage screw type manual operator, turn red knob clockwise until

it hits a stop. Valve will now be in the same position as when solenoid

is energized. Rotate knob fully counterclockwise to disengage.

CAUTION: For valve to operate electrically, manual

operator must be fully disengaged.

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.

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.

Temperature Limitations

See separate solenoid Installation and Maintenance Instructions for

maximum ambient temperature Maximum fluid temperature is

180_F (82_C)

Positioning

Valve may be mounted in any position.

Mounting Solenoid Valve to NAMUR Actuator

Valves are supplied with a hardware kit containing two port gaskets

and three sets of mounting screws; sizes: M5, .190-24 UNC-2A and

.190-32 UNF-2A. Align port 2 and 3 port gaskets and solenoid

valve on actuator. Then install two hex head screws in offset center

holes on either side. Hand thread screws a few turns into actuator.

Then tighten screws evenly using a 5/16

I or 8 mm wrench.

Figure 1. Mounting Dimensions

1.26

[32]

.95

[24]

2 mounting holes

locating hole

port gaskets (2)

Piping

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 as possible to connection point.

NOTE: The exhaust and/or pressure lines may be restricted to

control actuator speed.

CAUTION: To protect the solenoid valve, install a strainer

or filter, suitable for the service involved, in the inlet side as

close to the valve as possible. Clean periodically depending

on service conditions. See ASCO Series 8600, 8601, and 8602

for strainers.

Need help?

Do you have a question about the ASCO Valves 8320 Series and is the answer not in the manual?

Summary

Description and Operation

Valve Description

Series 8320 valves are 3-way normally closed direct mounted solenoid valves for air or inert gas.

Valve Operation Modes

Explains flow paths when solenoid is de-energized and energized, and breather function.

Installation Guidelines

Mounting and Piping

Instructions for mounting the valve to an actuator and connecting piping.

Manual Operation

Details momentary push and maintained screw type manual operators.

Temperature and Service Notes

Covers temperature limits, positioning, and future service considerations.

Maintenance Procedures

Cleaning and Preventive Maintenance

Guidance on periodic cleaning, preventive measures, and exercising the valve.

Causes of Improper Operation

Identifies incorrect pressure and excessive leakage as common issues.

Valve Disassembly and Reassembly

Step-by-step instructions for taking apart and putting the valve back together.

Parts Identification and Ordering

Manual Operator Types

Illustrates push type and screw type manual operators for optional features.

Valve Component Diagram

Exploded view of Series 8320 valve showing all parts and their assembly.

Rebuild Kit Information

Details on parts included in rebuild kits and how to order them.