Liquid Controls A2800 Series Solenoid Operated Block Valves

Introduction

This manual provides installation and parts information for the Liquid Controls A2800 Series Solenoid Operated Block Valves. These valves are designed for use with LectroCount electronic registers.

Safety Procedures

Safely Evacuate Piping System

⚠️ WARNING

Before disassembly of any meter or accessory component:

• ALL INTERNAL PRESSURES MUST BE RELIEVED AND ALL LIQUID DRAINED FROM THE SYSTEM IN ACCORDANCE WITH ALL APPLICABLE PROCEDURES.
• Pressure must be 0 (zero) psi.
• Close all liquid and vapor lines between the meter and liquid source.

Failure to follow this warning could result in property damage, personal injury, or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.

Observe National and Local Codes

⚠️ WARNING

Power, input, and output (I/O) wiring must be in accordance with the area classification for which it is used. This may require using connections or other adaptations in accordance with the requirements of the authority having jurisdiction.

WARNING: Explosion Hazard

• Substitution of components may impair suitability for Class I, Division 2 applications.
• When in hazardous locations, turn power OFF before replacing or wiring modules.
• Do NOT disconnect equipment unless power has been switched OFF or the area is known to be Non-Hazardous.

A2800 Series Block Valve Overview

The Liquid Controls A2800 Series Solenoid Operated Block Valves are designed for use with LectroCount electronic registers. Four models are available:

• A2843: Single-stage valve with overmolded, soft-seat piston; braided metal solenoid hoses and a 3-way solenoid (Model 82102 or 82102-24); used in LPG applications.
• A2859-11: Two-stage preset version incorporates a 2-way, “bypass” solenoid added to the A2843 valve for precise “0” shut-off and to prevent hydraulic shock. The A2859-11 two-stage, solenoid operated block valve is used for LPG applications.
• A2847-11: Single-stage valve with overmolded, soft-seat piston; flared copper solenoid tubing; and a 3-way solenoid. Used for refined fuels applications where a single stage, solenoid operated block valve function is required.
• A2848-11: Two-stage preset version incorporates a 2-way, “bypass” solenoid added to the A2847-11 valve for precise “0” shut-off and hydraulic shock prevention. The A2848-11 two-stage, solenoid operated block valve is used for refined fuels applications.

Note: Metallurgical and seal material changes may be needed for other applications (example: methanol). Consult factory if your application is not listed.

Specifications

Temperature Range: -40 to 160 °F (-40 to 71 °C)

Pressure Rating

LPG

• Maximum non-shock working pressure: 350 PSI (24 BAR)
• Maximum differential pressure: 125 PSI (86 BAR)

Refined Fuels

• Maximum non-shock working pressure: 150 PSI (10 BAR)
• Maximum differential pressure: 100 PSI (69 BAR)

Materials of Construction

• Main valve body and bonnet/cap: A3560 anodized aluminum
• Main valve internal trim: Anodized aluminum, brass, plated steel
• Elastomers: Valve diaphragm and 0-ring seals standard Buna-N UL approved

Solenoids Output

• Voltage: 10.2 to 27.2 VDC
• Current: 1 A maximum

Regulatory

• Explosion-proof, UL approved for NEMA 7 requirements for Class I, Division 2, Group C and D hazardous locations

Model Flowrates and Pressure Ratings

Installation

New Installations

When ordered with a new meter, the A2800 Series solenoid operated block valves are mounted to the meter at the factory. The valve solenoids are prewired to the LectroCount electronic register and optical or vapor eliminators (if included in system) at the factory. Connect the system piping to the 2" NPT flange on the outlet side of the block valve.

Illustration shows an M-7 Flowmeter unit with a block valve (no solenoids), an optical vapor eliminator, a strainer, and a LectroCount LCR-II electronic register.

Retrofit Installations

Depending on the existing configuration, adding a block valve may require modification of the outlet piping. After the internal pressure is relieved from the system, the outlet line can be disconnected from the mechanical valve being replaced. The new valve assembly can then be connected to the outlet side of the positive displacement meter. Use the four bolts and washers to fasten the valve assembly to the meter. The valve has an arrow showing the direction of flow. Ensure that the valve is properly oriented. Tighten the bolts in a crossing pattern. Once this is complete, the outlet piping may be reconnected to the outlet side of the differential preset valve. The valve outlet fitting is 2" NPT. Wiring instructions for each of the models are covered on pages 6-9.

⚠️ WARNING

Before disassembly of any meter or accessory component:

• ALL INTERNAL PRESSURES MUST BE RELIEVED AND ALL LIQUID DRAINED FROM THE SYSTEM IN ACCORDANCE WITH ALL APPLICABLE PROCEDURES.
• Pressure must be 0 (zero) psi.
• Close all liquid and vapor lines between the meter and liquid source.

Failure to follow this warning could result in property damage, personal injury, or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.

Diagram shows a system including an Air Eliminator (optical), LectroCount Electronic Register, Flowmeter, Strainer (high capacity), and a Block Valve (2-stage preset), illustrating typical connections.

Model Specific Details

A2843 Valve - Single-Stage LPG Applications

Supply voltage to the LectroCount LCR or LCR-II must be +24 VDC when using the 82102-24 Solenoid Kit.

Electrical Sequencing:

The electrical sequencing diagram illustrates the operation of the solenoid for product flow. When Solenoid 1 is OFF, there is No Flow. When Solenoid 1 is ON, there is Full Flow. Solenoid ZERO Shutoff is Self Adjusting.

** SOLENOID WARNING: The earth ground to the green screw on the solenoid terminal block is not essential for the operation of the device. In a truck application the solenoid is automatically grounded to the truck chassis via the liquid carrying piping. Check any applicable electrical codes to comply with proper grounding procedures.

Two-Stage LPG Applications - A2859-11 Valve

Electrical Sequencing:

The electrical sequencing diagram shows the operation of Solenoid 1 and Solenoid 2. Solenoid 1 controls the initial flow, and Solenoid 2 manages the 'Dwell Flow'. When both solenoids are OFF, there is No Flow. When Solenoid 1 is ON, there is Full Flow. When Solenoid 2 is ON, Dwell Flow occurs. Solenoid ZERO Shutoff is Self Adjusting.

** SOLENOID WARNING: The earth ground to the green screw on the solenoid terminal block is not essential for the operation of the device. In a truck application the solenoid is automatically grounded to the truck chassis via the liquid carrying piping. Check any applicable electrical codes to comply with proper grounding procedures.

A2847-11 Valve - Single-Stage Refined Fuel Applications

Electrical Sequencing:

The electrical sequencing diagram illustrates the operation of Solenoid 1 for product flow. When Solenoid 1 is OFF, there is No Flow. When Solenoid 1 is ON, there is Full Flow. Solenoid ZERO Shutoff is Self Adjusting.

** SOLENOID WARNING: The earth ground to the green screw on the solenoid terminal block is not essential for the operation of the device. In a truck application the solenoid is automatically grounded to the truck chassis via the liquid carrying piping. Check any applicable electrical codes to comply with proper grounding procedures.

Two-Stage Refined Fuel Applications - A2848-11 Valves

Electrical Sequencing:

The electrical sequencing diagram shows the operation of Solenoid 1 and Solenoid 2. Solenoid 1 controls the initial flow, and Solenoid 2 manages the 'Dwell Flow'. When both solenoids are OFF, there is No Flow. When Solenoid 1 is ON, there is Full Flow. When Solenoid 2 is ON, Dwell Flow occurs. Solenoid ZERO Shutoff is Self Adjusting.

** SOLENOID WARNING: The earth ground to the green screw on the solenoid terminal block is not essential for the operation of the device. In a truck application the solenoid is automatically grounded to the truck chassis via the liquid carrying piping. Check any applicable electrical codes to comply with proper grounding procedures.

Disassembly - Disassembly Kit

The Block Valve Disassembly Kit is used to disassemble A2800 Series block valves. The kit includes a nut, washer, and threaded rod. Together, the kit items screw down through the top opening of the block valve into a stand-off inside the valve. As the kit screws into the stand-off, it compresses the compression spring inside the valve, freeing the valve cover from the compression spring's pressure and allowing the twelve valve cover screws to be removed easily.

To remove the cover from the block valve:

1. Safely drain all liquid from the meter system (and all piping). See warning below.
2. Remove any plumbing from the hole at the top of the valve cover.
3. Insert the threaded rod into the hole and screw it into the stand-off inside the valve.
4. Slide the washer over the threaded rod.
5. Screw nut onto the threaded rod until it is flush with the top of the cover.
6. Remove screws from valve cover.
7. Slowly loosen the nut until the cover can be removed.

⚠️ WARNING

Before disassembly of any meter or accessory component:

• ALL INTERNAL PRESSURES MUST BE RELIEVED AND ALL LIQUID DRAINED FROM THE SYSTEM IN ACCORDANCE WITH ALL APPLICABLE PROCEDURES.
• Pressure must be 0 (zero) psi.
• Close all liquid and vapor lines between the meter and liquid source.

Failure to follow this warning could result in property damage, personal injury, or death from fire and/or explosion, or other hazards that may be associated with this type of equipment.

Illustration shows the Disassembly Kit components: Nut (06055), Washer (06663), Threaded Rod (47098). It also depicts the valve components: Valve Cover Screws, Valve Cover, Compression Spring, and Stand-off, illustrating how the kit is used for disassembly.

Illustrated Parts Breakdown

A2843 Valve Assembly

Items specific to the 49971 and 501339 assemblies are indicated.

Illustration of the A2843 Valve Assembly with numbered components corresponding to the parts list. Includes a Disassembly Kit diagram showing parts 510, 735, 275.

82102 & 82102-24 Solenoid Kit

These two items are used with model A2843 in LPG applications.

Diagrams show the integration of the 3-Way Solenoid Valve Assembly (labeled 1) and Hose Assembly (labeled 7) with the Differential Valve Assembly, Air Eliminator Assembly, and LectroCount Electronic Registers (Class I, Div. 1 and Div. 2 Enclosures).

A2859-11 Two-Stage Valve

The A2859-11 LPG Two-Stage Valve comes with the following kits: 82584 S1 Solenoid Kit (3-way solenoid with brass bittings and hoses); 3-way Solenoid Valve Assembly can be ordered as a single part as Part Number 81868; 81859 Two-Stage Cable Kit.

Illustration of the A2859-11 Two-Stage Valve with numbered components. Shows the valve assembly (115), 2-way solenoid (125), pipe nipple (160), and hose assembly (170).

A2847-11 Single Stage Valve

Illustration of the A2847-11 Single Stage Valve with numbered components and dimensions, including conduit connection and minimum clearance requirements.

A2848-11 Two-Stage Valve

Illustration of the A2848-11 Two-Stage Valve with numbered components and dimensions, showing conduit connection and minimum clearance requirements.