Transmitters VR
| Description | Series |
|---|---|
| Relay valve | VR4151，4152 |
| Shuttle valve | VR1210，1220 VR1210F，VR1220F |
| AND valve | VR1211F |
| Time delay valve | VR2110 |
| Pneumatic Indicator | VR3100，3110 |
| Pneumatic-electric relay | VR3200，3201 |