Features
Function and Description
Pressure or Vacuum Relief Valve for High System Pressures
The PROTEGO® In-Line Valve DZ/T-F is a state-of-the-art Pressure or Vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. Relief Valve for higher system pressures. Typically, the valve is installed in the in-breathing or outbreathing lines of tanks, vessels, and process equipment Equipment Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion. to protect against unallowable overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. or underpressure. The valve prevents emission losses almost up to the set pressure Set pressure Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. and prevents unacceptable product Product Includes equipment, protective systems, devices, components and combinations of these. . This springloaded model allows higher set pressures than the DZ/T.
Full Lift Technology
The device Device A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow. will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift Lift Lift is the actual travel of the valve pallet from the main valve out of the closed position. . Continuous investments in and a commitment to research and development have allowed PROTEGO® to develop a low pressure Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric 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 Maximum allowable working pressure (MAWP) Maximum gauge pressure permissible at the top of a completed vessel in its normal operating position at the designated coincident temperature specified for that pressure. or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic is the same for pressure and vacuum relief.
Advanced Manufacturing Technology
Due to our highly developed manufacturing technology, the tank pressure Tank pressure Tank pressure is the pressure within a tank. 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) and sturdy housing Housing A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. design. After the overpressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal Seal A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. . The optimized fluid dynamic design of the valve body and valve pallet Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. 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 Nominal size The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. (DN), please use the flow capacity charts on the following pages
| DN | 25 / 1" | 32 / 1¼“ | 40 / 1½“ | 50 / 2" | 80 / 3" | 100 / 4" | 125 / 5" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| a | 220 / 8.66 | 220 / 8.66 | 250 / 9.84 | 250 / 9.84 | 340 / 13.39 | 380 / 14.96 | 460 / 18.11 | 460 / 18.11 | 550 / 21.65 | 650 / 25.59 | 700 / 27.56 |
| b | 150 / 5.91 | 150 / 5.91 | 170 / 6.69 | 170 / 6.69 | 235/ 9.25 | 280 / 11.02 | 335 / 13.19 | 335 / 13.19 | 420 / 16.54 | 505 / 19.88 | 565 / 22.24 |
| c | 395 / 15.55 | 395 / 15.55 | 420 / 16.54 | 420 / 16.54 | 570 / 22.44 | 680 / 26.77 | 940 / 37.01 | 940 / 37.01 | 1160 / 45.67 | 1215 / 47.83 | 1255 / 49.41 |
Dimensions in mm / inches
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Heating jacket (DZ / T-F-H-...) | Steel | Stainless Steel |
| Valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. | Stainless Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
| Valve pallet | A | A |
Option: Housing with ECTFE- lining Lining Protective plastic lining with a defined minimum/maximum thickness to protect against aggressive mixtures (e.g., acid).
Special materials upon request
Material selection for valve pallet
| Design | A |
| Pressure range [mbar] [inch W.C.] | ±60 up to ±500 ±24 up to ±200 |
| Valve pallet | Stainless Steel |
| Sealing | Metal to Metal |
| Spring Spring A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. | Stainless Steel |
Special materials upon request.
Devices with higher set pressure or vacuum are available upon request, for lower set pressure or vacuum refer to type DZ/T
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 spring loaded. Lower set pressures for pressure and vacuum are achieved by using the weight loaded type DZ/T.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
| Pressure or vacuum settings: | ±60 mbar | ±500 mbar |
| ±24 inch W.C. | ±200 innch W.C. | |
| ±60 mbar | ±400 mbar | |
| ±24 inch W.C. | ±160 inch W.C. | |
| ±60 mbar | ±300 mbar | |
| ±24 inch W.C. | ±120 inch W.C. |
Devices with higher set pressure or vacuum are available upon request, for lower set pressures or vacuum refer to type DZ/T.
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”.
