
| SRH | 4 | 0 | 0 | 0 | 04 | □ | ||||
| Body size | Washing grade | Set pressure | Relief mechanism | Port size | Gauge port orientation | |||||
| 3:1/4 | 0 | Grade A | 0 | 0.02~0.2mMPa | 0 | Non-relief | Symbol | Plping port size | Nil:standard | |
| 4:3/8 | 1 | Grade B | 1 | 0.05~0.7mMPa | 1 | relief | 04 | Rc1/2 | R:R Specification | |