ASCO 262A3.. Series 2-Way Direct Acting Solenoid Valves

Important Information

Refer to separate solenoid installation and maintenance instructions (I&M) for information on: Electrical installation, explosionproof classification, temperature limitations, causes of improper electrical operation, coil and solenoid replacement.

Description

Series 262A3.. valves are 2-way direct acting solenoid valves designed for air or inert gas. All pipe connections are located in the body. The body construction is stainless steel. Valves are available with several low power, general purpose or explosionproof solenoid operators.

Operation

Valves are Normally Closed construction. The valve is closed when de-energized; open when energized.

Important: No minimum operating pressure required. Upon loss of power and/or pressure the valve will return to its original position.

Installation

• Check nameplate for correct catalogue number, pressure, voltage, frequency and service.
• Never apply incompatible fluids or exceed pressure ratings of the valve.

Note: Inlet port will either be marked ‘I’ or ‘IN’. Outlet port will be marked ‘2’.

Temperature Limitations

Ambient temperature must be within the range stated on the nameplate. Ambient and fluid temperature range is -40°C/+60°C.

Mounting Position

Valve may be mounted in any position.

Piping

Connect piping to the valve according to the markings on the valve body. Refer to flow diagram Fig. 1. Apply pipe compound sparingly to male pipe threads only; if applied to valve threads, it may enter valve and cause malfunction. Pipe strain should be avoided by proper support and alignment of piping. When tightening pipe, do not use valve as a lever.

Important: For protection of the solenoid valve, install a strainer or filter suitable for the service involved in the inlet side as close to the valve as possible. Periodic cleaning is required depending on the service conditions.

These solenoid valves are intended for use on clean dry air or inert gas, filtered to 50 micrometers or better.

The dew point of the media should be at least 10°C (18°F) below the minimum temperature to which any portion of the clean air/inert gas system could be exposed to prevent freezing. If lubricated air is used, the lubricants must be compatible with Buna N elastomers. Diester oils may cause operational problems.

Electrical Installation

Refer to separate I&M sheet of the solenoid for electrical installation.

Maintenance

Warning: To prevent the possibility of personal injury or property damage, turn off electrical power, depressurise valve, 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.

Cleaning

All solenoid valves should be cleaned periodically. The time between cleanings will vary depending on the medium and service conditions. In general, if the voltage to the coil is correct, sluggish valve operation, excessive noise or leakage will indicate that cleaning is required. In the extreme case, faulty valve operation will occur and the valve may fail to shift. Clean strainer or filter when cleaning the valve.

Preventive Maintenance

Keep the medium flowing through the valve as free from dirt and foreign material as possible. Depending on the medium and service condition, periodic inspection of internal valve parts for damage or excessive wear is recommended. Thoroughly clean all parts. If parts are worn or damaged, install a complete ASCO Rebuild Kit.

Causes of Improper Operation

1. Incorrect Pressure: Check valve pressure. Pressure to valve must be within range specified on nameplate.
2. Excessive Leakage: Disassemble valve and install a complete ASCO Rebuild Kit.

Spare Parts Kit

Spare Parts Kit and coils are available for ASCO valves. Parts marked with an asterisk (*) are included in these kits.

When ordering kits or coils, specify valve catalogue number, serial number and voltage.

Coil Replacement

Refer to separate I&M sheet of the solenoid for coil replacement.

Valve Disassembly

Warning: To prevent the possibility of personal injury or property damage, turn off electrical power, depressurize the valve, and vent fluid to a safe area before servicing the valve.

Note: It is not necessary to remove the valve from the pipeline for repairs.

1. Refer to separate I&M sheet for disassembling the solenoid.
2. Unscrew cartridge assembly from valve body. Then remove cartridge gasket and seat gasket.
3. Clean valve and install a complete ASCO Rebuild Kit.

Valve Reassembly

Note: Refer to separate I&M sheet for reassembling the solenoid.

Reassemble in reverse order of disassembly paying careful attention to exploded views provided for identification and placement of parts.

1. Lubricate all gaskets with Dow Corning 111 Compound lubricant or an equivalent high-grade silicone grease.
2. Position cartridge gasket in valve body.
3. Install seat gasket in recess in base of cartridge assembly.
4. Thread cartridge assembly with seat gasket into valve body. Then torque cartridge assembly to 19,8±2,8Nm (175±25 in-lbs).
5. Install solenoid, see separate instructions, and electrical connection to solenoid.
6. With air supply reconnected, energize the valve several times to confirm correct operation of valve.

Diagrams and Parts

Valve Components

• 1. Cartridge assembly
• 2. O-ring, valve body
• 3. O-ring, valve body
• 4. Valve body
• 5. Mounting bracket

Torque Chart