Pilot-Operated Relief Valve
| Controlled Port | Model |
| A | HT3H-A-D*-025B |
| HT3H-A-D*E-025B | |
| HT3H-A-D*S-025B | |
| HT3H-A-D*ES-025B | |
| B | HT3H-B-D*-025B |
| HT3H-B-D*E-025B | |
| HT3H-B-D*S-025B | |
| HT3H-B-D*ES-025B | |
| A/B | HT3H-W-D*-025B |
| Controlled Port | Model |
| A | HT3H-A-D*-025B |
| HT3H-A-D*E-025B | |
| HT3H-A-D*S-025B | |
| HT3H-A-D*ES-025B | |
| B | HT3H-B-D*-025B |
| HT3H-B-D*E-025B | |
| HT3H-B-D*S-025B | |
| HT3H-B-D*ES-025B | |
| A/B | HT3H-W-D*-025B |