DV/ZT
Pressure and Vacuum Relief Valve, In-Line
Features
10% Technology
for Minimum Pressure Increase up to Full Lift
Extreme Tightness
Resulting in Lowest Possible Product Losses and Reduced Environmental Pollution
Optimum Pressure Maintenance
Based on 10% Technology, Set Pressure Is Close to Opening Pressure for Optimum Pressure Maintenance in the System as Compared to Conventional 40% or 100% Technology
High Flow Capacity
Reduces Costs Through the Use of Smaller Valves
Used in Explosion Hazardous Areas
can Be Used in Explosion Hazardous Areas
Sturdy Housing Design
(PN 10 and PN 16)
Function and Description
Pressure or Backflow Protection in Venting or Exhaust Lines
The PROTEGO® In-Line Valve DV/ZT is a state-of-the-art Pressure and Vacuum Relief Valve. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels and process equipment to protect against unallowable overpressure and underpressure. The valve prevents emission losses almost up to the set pressure and provides protection from product entry into the system. For structural reasons, the lower valve pallet is one size smaller than the upper valve pallet.
Full Lift Technology
The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. Continuous investments in and a commitment to research and development have allowed PROTEGO® to develop a low pressure valve which has the same opening characteristic as a high pressure safety relief valve. This “Full Lift Type” technology allows the valve to be set at just 10% below the maximum allowable working pressure or vacuum (MAWP or MAWV) of the tank and still safely vent the required mass flow.
Due to our highly developed manufacturing technology, the tank pressure is maintained up to set pressure with a tightness that is far above the conventional standard.
Custom Materials
This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), or with an air cushion seal (2), in conjunction with high quality FEP diaphragm. The valve pallets are also available with a PTFE seal to prevent the valve pallets from sticking when sticky products are used and to enable the use of corrosive fluids. After the overpressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal.
The optimized fluid dynamic design of the valve body and valve pallet is a result of many years of research, resulting in stable operation of the valve pallet, optimized performance, and reduced product losses.
Product Data
Dimensions
To select the nominal size (DN), please use the flow capacity chart on the following page
| DN | 40 / 1½“ | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" |
| a | 280 / 11.02 | 280 / 11.02 | 340 / 13.39 | 390 / 15.35 | 520 / 20.47 |
| b | 270 / 10.63 | 270 / 10.63 | 290 / 11.42 | 355 / 13.98 | 425 / 16.73 |
| c | 210 / 8.27 | 210 / 8.27 | 280 / 11.02 | 310 / 12.20 | 390 / 15.35 |
Dimensions in mm / inches
Larger sizes upon request
Dimensions for pressure and vacuum relief valve with heating jacket upon request
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Heating jacket (DV / ZT-H-...) | Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
Option: Housing with ECTFE-lining
Special materials upon request
Material selection for upper valve pallet
| Design | A | B | C | D |
| Pressure range [mbar] [inch W.C.] | ±2.0 up to ±3.5 ±0.8 up to ±1.4 | ±3.5 up to ±14 >±1.4 up to ±5.6 | ±14 up to ±60 >±5.6 up to ±24 | ±14 up to ±60 >±5.6 up to ±24 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | PTFE |
Special materials upon request
For higher set pressure refer to type DV/ZT-F.
Material selection for lower valve pallet
| Design | A | B | C | D | E | F |
| Pressure range [mbar] [inch W.C.] | ±2,0 up to ±3,5 ±0.8 up to ±1.4 | ±3,5 up to ±14 ±1.4 up to ±5.6 | ±14 up to ±35 ±5.6 up to ±14 | ±35 up to ±50 ±14 up to ±20 | ±14 up to ±35 ±5.6 up to ±14 | ±35 up to ±50 ±14 up to ±20 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | Metal to Metal | PTFE | PTFE |
Special materials and lower set vacuum upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Flow Capacity Chart
The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.
Detail X
Detail X
Tank connection; Other arrangement of the tank connection upon request.