Check Valve
| Controlled Port | Model |
| A | HK3H-A-Q*-025B |
| HK3H-A-Q*-03 | |
| HK3H-A-Q*-06 | |
| B | HK3H-B-Q*-025B |
| HK3H-B-Q*-03 | |
| HK3H-B-Q*-06 | |
| A/B | HK3H-W-Q*-025B |
| HK3H-W-Q*-03 | |
| HK3H-W-Q*-06 | |
| P | HK3H-P-Q*-025B |
| HK3H-P-Q*-03 | |
| HK3H-P-Q*-06 | |
| R | HK3H-R-Q*-025B |
| HK3H-R-Q*-03 | |
| HK3H-R-Q*-06 |