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PROTEGO
Excellence in Safety and Environment

DV/ZT

Pressure and Vacuum Relief Valve, In-Line

Features

10% Technology
for minimum pressure increase up to full lift Lift Lift is the actual travel of the valve pallet from the main valve out of the closed position.
Extreme Tightness
resulting in lowest possible product Product Includes equipment, protective systems, devices, components and combinations of these. losses and reduced environmental pollution
Optimum Pressure Maintenance
based on 10% technology , 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. is close to opening pressure for optimum pressure maintenance Maintenance Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order. 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 Explosion Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously. 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 Pressure and vacuum relief valve A pressure and vacuum relief valve is a pressure equalization valve for impermissible pressure and vacuum in a closed system. . Typically, the valve is installed in the in-breathing and out-breathing 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. 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 Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. is one size smaller than the upper valve pallet.

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. 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 Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. (MAWP or MAWV) of the tank and still safely vent the required mass flow. 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.

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 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. (2), in conjunction with high quality FEP diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. . 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 and Features

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 chart on the following page

DN40 / 1½“ 50 / 2" 80 / 3" 100 / 4" 150 / 6"
a280 / 11.02280 / 11.02340 / 13.39390 / 15.35520 / 20.47
b270 / 10.63270 / 10.63290 / 11.42355 / 13.98425 / 16.73
c210 / 8.27210 / 8.27280 / 11.02310 / 12.20390 / 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 upper valve pallet

Design ABCD
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 palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE

Special materials upon request

For higher set pressure refer to type DV/ZT-F.

Material selection for lower valve pallet

Design ABCDEF
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 palletAluminiumStainless SteelStainless SteelStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalMetal to MetalPTFEPTFE

Special materials and lower set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5 CL 150 R.F.

other types upon request

Design Types and Specifications

The valve pallets are weight loaded. Higher set pressures are achieved by using spring Spring A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. loaded type DV/ZT-F
Two different designs are available:
In-line pressure and vacuum relief valve, standard designDV/ZT - –
In-line pressure and vacuum relief valve with heating jacketDV/ZT - 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).

Settings

Upper valve pallet:±2.0 mbar±60 mbar
±0.8 inch W.C.±24 inch W.C.
Lower valve pallet:±3.5 mbar±50 mbar
±1.4 inch W.C.±20 inch W.C.

For higher set pressure refer to type DV/ZT-F.
Lower set vacuum 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.

Applications