ZDM series automatic circulation pump protection valve is a pump protection device. It automatically protects some of the cavitation damage and instability that may occur in the pump body during the low load operation of the centrifugal pump (especially for conveying hot water medium). Once the pump flow is lower than the preset flow, the bypass is fully opened to ensure that the pump requires the minimum flow. Even if the main road is completely closed, ie the main road flow is zero, the minimum flow can also be automatically cycled through the bypass. Pressure is reduced by the integrated multi-stage throttle relief valve in the bypass. The ZDM series has a bypass suitable for high differential pressure, and the pressure difference is up to 30 MPa. The specific choice is determined by the factory. The multi-stage pressure-reducing M-type bypass bypasses the noise generated by high-speed flowing media and prevents cavitation and flashing from damaging valve components.
Anti-cavitation multi-stage depressurization bypass reduces the flow rate and is suitable for high-pressure operation
Forged body, optional carbon steel or stainless steel
Standard bypass with check function, maximum working pressure difference up to 30MPa
This valve does not have any drive method.
| Size | in | 2 | 2 1/2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
| mm | 50 | 65 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | |
| L/L1(RF/BW) | in | 17.75 | 20.00 | 22.75 | 26.5 | 36.00 | 40.25 | 50.00 | 56.00 | / | / |
| mm | 451 | 508 | 578 | 673 | 914 | 1022 | 1270 | 1422 | / | / | |
| L2(RTJ) | in | 17.88 | 21.25 | 23.00 | 26.88 | 36.50 | 40.88 | 50.88 | 56.88 | / | / |
| mm | 454 | 540 | 584 | 683 | 927 | 1038 | 1292 | 1445 | / | / | |
| H | in | 7.50 | 9.00 | 11.00 | 14.12 | 15.75 | 18.88 | 20.50 | 26.38 | / | / |
| mm | 190 | 230 | 280 | 360 | 400 | 480 | 520 | 670 | / | / | |
| W | in | 24 | 32 | 32 | 32 | 32 | 40 | 40 | 40 | / | / |
| mm | 600 | 800 | 800 | 800 | 800 | 1000 | 1000 | 1000 | / | / | |
| WT(Kg) | RF/RTJ | 68 | 95 | 120 | 185 | 675 | 1100 | 1650 | 2300 | / | / |
| BW | 54 | 74 | 91 | 122 | 555 | 918 | 1355 | 2950 | / | / |
| Valve brand | GOOLE |
| Valve Model | HDTM |
| Connection form | flange; welding |
| Product material | Forged steel A105/F304 |
| Nominal diameter | DN40~DN500 |
| Adapt to medium | water, steam, etc |
| Pressure rating | PN16-PN420 |
