Features
Function and Description
Pressure or Backflow Protection in Venting or Exhaust Lines
The PROTEGO® In-Line Valve DZ/T is a state-of-the-art Pressure or Vacuum Relief Valve. Typically, the valve is installed in the in-breathing or out-breathing lines of tanks, vessels, and process equipment to protect against unallowable overpressure or underpressure. The valve prevents emission losses almost up to the set pressure and prevents unacceptable product entry.
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.
Advanced Manufacturing Technology
This “Full Lift Type” technology allows the valve to be set at just 10% below the maximum allowable working pressure or vacuum ( MAWP Maximal erlaubter Betriebsdruck (MAWP) Maximaler zulässiger Überdruck im oberen Bereich eines kompletten Behälters in normaler Betriebsstellung bei der genannten übereinstimmenden Temperatur, die für diesen Druck spezifiziert ist. 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. 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.
Dimensions
To select the nominal size (DN), please use the flow capacity chart on the following page
| DN | 25 / 1" | 32 / 1¼“ | 40 / 1½“ | 50 / 2" | 65 / 2½“ | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| a | 220 / 8.66 | 220 / 8.66 | 250 / 9.84 | 250 / 9.84 | 340 / 13.39 | 340 / 13.39 | 380 / 14.96 | 460 / 18.11 | 550 / 21.65 | 650 / 25.59 | 700 / 27.56 |
| b | 140 / 5.51 | 140 / 5.51 | 190 / 7.48 | 190 / 7.48 | 210 / 8.27 | 210 / 8.27 | 240 / 9.45 | 305 / 12.01 | 460 / 18.11 | 515 / 20.28 | 555 / 21.85 |
| c | 150 / 5.91 | 150 / 5.91 | 170 / 6.69 | 170 / 6.69 | 235 / 9.25 | 235 / 9.25 | 280 / 11.02 | 335 / 13.19 | 420 / 16.54 | 505 / 19.88 | 565 / 22.24 |
Dimensions in mm / inches
Dimensions for pressure or vacuum relief valve with heating jacket upon request
Material selection for housing
| Design | A | B | C |
| Housing | Steel | Stainless Steel | Hastelloy |
| Heating jacket (DZ / T-H-...) | Steel | Stainless Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Hastelloy |
| Gasket | PTFE | PTFE | PTFE |
| Valve pallet DN 40 - 300 / 1½" - 12" | A, C, E, F | A, C, E, F | B, D, G |
| Valve pallet DN 25 - 32 / 1" - 1¼" | H, I, J | H, I, J | – |
Option: Housing with ECTFE-lining
Special materials upon request
Material selection for valve pallet
| DN 40-300 / 1½" - 12'' | |||||||
| Design | A | B | C | D | E | F | G |
| Pressure range [mbar] [inch W.C.] | ±2,0 up to ±3,5 ±0.8 up to ±1.4 | ±2,0 up to ±3,5 ±0.8 up to ±1.4 | ±3,5 up to ±14 ±1.4 up to ±5.6 | ±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 | ±14 up to ±60 ±5.6 up to ±24 |
| Valve pallet | Aluminium | Titanium | Stainless Steel | Titanium | Stainless Steel | Stainless Steel | Hastelloy |
| Sealing | FEP | FEP | FEP | FEP | Metal to Metal | PTFE | Metal to Metal |
| DN 25-32 / 1'' - 1¼" | |||||||
| Design | H | I | J | ||||
| Pressure range [mbar] [inch W.C.] | ±3,5 up to ±15 ±1.4 up to ±6.0 | ±15 up to ±60 ±6.0 up to ±24 | ±15 up to ±60 ±6.0 up to ±24 | ||||
| Valve pallet | PTFE | Stainless Steel | Stainless Steel | ||||
| Sealing | PTFE | Metal to Metal | PTFE |
Special materials upon request
For higher set pressure or vacuum refer to type DZ/T-F
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other connections upon request
Design Types and Specifications
The valve pallet is weight loaded. Higher set pressures for pressure and vacuum are achieved by using spring loaded type DZ/T-F.Two different designs are available:
Additional special devices available upon request
Within piping systems the influence of backpressure has to be considered in deciding the set pressure and opening characteristics. For special design solutions (e.g. partial load operation) the valve can be supplied with standard valve pallets (with proportional opening function).
Settings
| DN 25 and 32 | ±3.5 mbar | ±60 mbar |
| ±1.4 inch W.C. | ±24 inch W.C. | |
| DN 40 up to 300 | ±2.0 mbar | ±60 mbar |
| ±0.8 inch W.C. | ±24 inch W.C. |
For higher set pressure or vacuum refer to type DZ/T-F
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”.
