DZ/E

DZ/E

Pressure or Vacuum Relief Valve, In-Line

Function and Description

The PROTEGO® in-line valve DZ/E is a state-of-the-art pressure or vacuum relief valve in right angle design. Typically the valve is installed in the in- or outbreathing lines of tanks, vessels and process apparatus to protect against unallowable high or low pressure. The valve prevents emission losses almost up to the set pressure or provides protection from product entry into the system.

The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. Continuous investments into 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 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 superior to the conventional standard. This feature is facilitated 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 excess pressure is discharged or the vacuum is compensated, the valve reseats 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 work, which allow a stable operation of the valve pallet and optimized performance resulting in reduction of product losses.

Features and Advantages

  • “full lift type” technology valve utilizes only 10% overpressure to reach full lift
  • high performance seal reducing product loss below EPA’s 500ppm rule preventing environmental pollution
  • based on 10% technology the set pressure is close to the opening pressure which results in best possible pressure management of the system compared to conventional 40%- or 100%- technology valves
  • optimized flow performance, which reduces capital cost to a minimum as smaller sized valves may be used
  • can be used as pressure or vacuum relief valve
  • compact right angle design saves space
  • can be installed in explosion hazardous areas
  • housing designed to 150 psi (PN 10)
  • maintenance friendly design

Dimensions

To select the nominal size (DN), please use the flow capacity chart on the following page

DN25 / 1" 32 / 1¼“40 / 1½“ 50 / 2"80 / 3"100 / 4" 150 / 6"200 / 8"250 / 10"300 / 12"
a110 / 4.33110 / 4.33125 / 4.92125 / 4.92170 / 6.69190 / 7.48230 / 9.06275 / 10.83325 / 12.80350 / 13.78
b75 / 2.9575 / 2.9590 / 3.5490 / 3.54115 / 4.53120 / 4.72160 / 6.30225 / 8.86275 / 10.83300 / 11.81
c180 / 7.09180 / 7.09230 / 9.06230 / 9.06245 / 9.65260 / 10.24335 / 13.19505 / 19.88575 / 22.64630 / 24.80
d150 / 5.91150 / 5.91170 / 6.69170 / 6.69235 / 9.25280 / 11.02335 / 13.19420 / 16.54505 / 19.88565 / 22.24
DN25 / 1" 32 / 1¼“40 / 1½“ 50 / 2"80 / 3"100 / 4" 150 / 6"200 / 8"250 / 10"300 / 12"
a110 / 4.33110 / 4.33125 / 4.92125 / 4.92170 / 6.69190 / 7.48230 / 9.06275 / 10.83325 / 12.80350 / 13.78
b75 / 2.9575 / 2.9590 / 3.5490 / 3.54115 / 4.53120 / 4.72160 / 6.30225 / 8.86275 / 10.83300 / 11.81
c180 / 7.09180 / 7.09230 / 9.06230 / 9.06245 / 9.65260 / 10.24335 / 13.19505 / 19.88575 / 22.64630 / 24.80
d150 / 5.91150 / 5.91170 / 6.69170 / 6.69235 / 9.25280 / 11.02335 / 13.19420 / 16.54505 / 19.88565 / 22.24

Dimensions in mm / inches

Dimensions for pressure or vacuum relief valve with heating jacket upon request

DZ/E

Flow direction marked at the housing by ->

Detail X

Detail X

Tank connection for pressure relief function

Tank connection for vacuum relief function

Material selection for housing

Design A B C
HousingSteelStainless SteelHastelloy
Heating jacket (DZ / E-H-...)SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelHastelloy
GasketPTFEPTFEPTFE
Valve pallet DN 40 - 300 / 1 ½" - 12"A, C, E, FA, C, E, FB, D, G
Valve pallet DN 25 - 32 / 1" - 1 ¼"H, I, JH, I, J
Design A B C
HousingSteelStainless SteelHastelloy
Heating jacket (DZ / E-H-...)SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelHastelloy
GasketPTFEPTFEPTFE
Valve pallet DN 40 - 300 / 1 ½" - 12"A, C, E, FA, C, E, FB, D, G
Valve pallet DN 25 - 32 / 1" - 1 ¼"H, I, JH, 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"
DesignHIJ
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 palletPTFEStainless SteelStainless Steel
SealingPTFEMetal to MetalPTFE
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"
DesignHIJ
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 palletPTFEStainless SteelStainless Steel
SealingPTFEMetal to MetalPTFE

For higher set pressure or vacuum refer to type DZ/E-F

Special materials upon request

DZ/E

Flow direction marked at the housing by ->

Detail X

Detail X

Tank connection for pressure relief function

Tank connection for vacuum relief function

Flange connection type

EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

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/E-F.
Two different right angle designs are available:

In-line pressure or vacuum relief valve, standard design

DZ/E - –

In-line pressure or vacuum relief valve with heating jacket

DZ/E - H

In-line pressure or vacuum relief valve, standard design

DZ/E - –

In-line pressure or vacuum relief valve with heating jacket

DZ/E - 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

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/E-F

DZ/E

Flow direction marked at the housing by ->

Detail X

Detail X

Tank connection for pressure relief function

Tank connection for vacuum relief function

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). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.

DZ/E

Flow direction marked at the housing by ->

Detail X

Detail X

Tank connection for pressure relief function

Tank connection for vacuum relief function

DZ/E

Flow direction marked at the housing by ->

Detail X

Detail X

Tank connection for pressure relief function

Tank connection for vacuum relief function