How to Connect Solenoid Valve to Relay?

In construction machinery, solenoid valves and relays are very important control components that play a key role in achieving fluid control and action in hydraulic and pneumatic systems. Properly connecting solenoid valves to relays is an important step in ensuring proper system operation.

In hydraulic and pneumatic systems, diesel solenoid valve and relays work in tandem to achieve precise control of fluid flow and movement. Correctly connecting solenoid valves to relays not only ensures the stable operation of the system, but also provides efficient operation and control capabilities for construction machinery. Let's take a closer look at the steps and points involved in connecting a solenoid valve to the electrical relays.

Step 1: Confirm solenoid valve and relay specifications

Before starting the connection, first confirm the specifications of the solenoid valves and relays. Check the identification and technical parameters of the solenoid valve and relay, including information on voltage, current, and energizing method. Make sure that the rated current of the relay is not less than the working current of the solenoid valve and that its rated voltage matches the working voltage of the solenoid valve.

Step 2: Prepare materials and tools

Prepare the following materials and tools before connection:

Solenoid valve: Select the appropriate solenoid valve according to the control demand.

Relay: Select the relay that matches the diesel solenoid valve.

Cables and plugs: Select cables and plugs suitable for solenoid valves and relays with proper length.

Screwdrivers, wire strippers, insulating tape and other tools.

Step 3: Understand solenoid valve wiring

Before connecting, make sure you understand how the solenoid valve is wired. Generally, solenoid valves have two wiring terminals: one is the energized terminal (marked + or IN) and the other is the de-energized terminal (marked - or OUT).

Step 4: Connecting the Solenoid to the Relay

Next, follow the steps below to connect the solenoid to the relay:

Connect the energized end of the solenoid to the control terminal of the relay: Use a cable to connect the energized end of the solenoid to the control terminal of the relay. Usually the control terminals of the relay are labeled "COM" (common), "C" or "1".

Connect the disconnect terminal of the solenoid valve to the switch terminal of the relay: Use another cable to connect the disconnect terminal of the solenoid valve to the switch terminal of the relay. Normally the switching terminal of the relay is labeled "NO" (normally open) or "1".

If the solenoid valve has an additional intermediate terminal, close it with insulating tape: Some solenoid valves may have an additional intermediate terminal for special control needs. If you do not use this intermediate terminal, close it with insulating tape to avoid electrical shorts.

Step 5: Check connections and fixings

After the connections have been made, double-check all wiring to ensure that the wire plugs are securely connected and have not fallen out or come loose. Also, check that the current rating of the relay matches the current rating of the solenoid valve to ensure safe operation of the system as well as proper functioning of the diesel engine spare parts. Make sure that all wires are securely fastened and not loose.

Step 6: Test the circuit

After the connections are made, it is very important to test the circuit. By applying power to the relay, observe if the solenoid valve operates properly and if the relay is able to control the solenoid valve on and off correctly. If all is well, congratulations, the solenoid has been successfully connected to the relay.

Reasonably connecting the solenoid valve to the relay not only improves the operation efficiency and flexibility of construction machinery, but also provides strong support for automation control. In the process of design and implementation, we should focus on the principles of safety, stability and intelligence to contribute to the excellent performance of construction machinery.