This document is an instruction manual for SMC Corporation's VXD21/22/23 series electric solenoid valves. It introduces specifications such as valve form, coil type, rated voltage, and material. It also provides safety precautions and troubleshooting strategies.
The manual covers safety precautions, flow characteristics, technical specifications, model designation, and fault diagnosis for the VXD21/22/23 series electromagnetic valves. It explains the correct use of safety symbols, recommended installation practices, and wiring options such as direct lead, conduit, DIN socket, and pipe‑thread connections.
Additional sections describe maintenance procedures, recommended torque values for pipe connections, coil type selections, and measures to prevent issues like leakage voltage, freezing, and vibration. Troubleshooting tables list common symptoms, causes, and corrective actions. This manual is written in Chinese.
| Coil Types | B type, H type |
|---|---|
| Pipe Thread Torque (Rc1/8) | 7~9 Nm |
| Pipe Thread Torque (Rc1/4) | 12~14 Nm |
AC B‑type coils must be limited to no more than 10 % of the rated voltage.
B‑type coils use AWG20 wire with an outer insulation diameter of 2.5 mm.
For Rc1/8 connections tighten to 7–9 Nm, and for Rc1/4 connections tighten to 12–14 Nm.