Pressure or Vacuum Relief Valve, In-Line
- 10% technology for minimum pressure increase up to full lift
- extreme tightness, resulting in lowest possible product losses and reduced environmental pollution
- 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
- can be used as pressure or vacuum relief valve
- can be used in explosion hazardous areas
- sturdy housing design (PN 10)
- spring-loaded for high set pressures
- maintenance-friendly design
Function and Description
The PROTEGO® in-line valve DZ/T-F is a state-of-the-art pressure or vacuum relief valve for higher system pressures. Typically, the valve is installed in the in-breathing or outbreathing 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. This springloaded model allows higher set pressures than the DZ/T.
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. The opening characteristic is the same for pressure and vacuum relief. 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) and sturdy housing design. 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.
To select the nominal size (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||250 / 9.84||340 / 13.39||380 / 14.96||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||170 / 6.69||235 / 9.25||280 / 11.02||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||420 / 16.54||570 / 22.44||680 / 26.77||940 / 37.01||1160 / 45.67||1215 / 47.83||1255 / 49.41|
Material selection for housing
|Heating jacket (DZ / T-F-H-...)||Steel||Stainless Steel|
|Valve seat||Stainless Steel||Stainless Steel|
Material selection for valve pallet
|Pressure range [mbar]|
±60 up to ±500
±24 up to ±200
|Valve pallet||Stainless Steel|
|Sealing||Metal to Metal|
Flange connection type
|EN 1092-1; Form B1|
|ASME B16.5 CL 150 R.F.|
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:
In-line pressure or vacuum relief valve, standard design
DZ/T-F - –
In-line pressure or vacuum relief valve with heating jacket
DZ/T-F - H
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).
|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.|
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”.