DZ/T

DZ/T

Pressure or Vacuum Relief Valve, In-Line

Function and Description

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. 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. 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.

Features and Advantages

  • 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)
  • 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" 65 / 2½“80 / 3" 100 / 4"150 / 6"200 / 8" 250 / 10" 300 / 12"
a220 / 8.66220 / 8.66250 / 9.84250 / 9.84340 / 13.39340 / 13.39380 / 14.96460 / 18.11550 / 21.65650 / 25.59700 / 27.56
b140 / 5.51140 / 5.51190 / 7.48190 / 7.48210 / 8.27210 / 8.27240 / 9.45305 / 12.01460 / 18.11515 / 20.28555 / 21.85
c150 / 5.91150 / 5.91170 / 6.69170 / 6.69235 / 9.25235 / 9.25280 / 11.02335 / 13.19420 / 16.54505 / 19.88565 / 22.24
DN25 / 1" 32 / 1¼“40 / 1½“ 50 / 2" 65 / 2½“80 / 3" 100 / 4"150 / 6"200 / 8" 250 / 10" 300 / 12"
a220 / 8.66220 / 8.66250 / 9.84250 / 9.84340 / 13.39340 / 13.39380 / 14.96460 / 18.11550 / 21.65650 / 25.59700 / 27.56
b140 / 5.51140 / 5.51190 / 7.48190 / 7.48210 / 8.27210 / 8.27240 / 9.45305 / 12.01460 / 18.11515 / 20.28555 / 21.85
c150 / 5.91150 / 5.91170 / 6.69170 / 6.69235 / 9.25235 / 9.25280 / 11.02335 / 13.19420 / 16.54505 / 19.88565 / 22.24

Dimensions in mm / inchesDimensions for pressure or vacuum relief valve with heating jacket upon request

DZ/T
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 ABC
HousingSteelStainless SteelHastelloy
Heating jacket (DZ / T-H-...)SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelHastelloy
GasketPTFEPTFEPTFE
Valve pallet DN 40 - 300 / 1½" - 12"A, C, E, FA, C, E, FB, D, G
Valve pallet DN 25 - 32 / 1" - 1¼"H, I, JH, I, J
Design ABC
HousingSteelStainless SteelHastelloy
Heating jacket (DZ / T-H-...)SteelStainless SteelStainless Steel
Valve seatStainless SteelStainless SteelHastelloy
GasketPTFEPTFEPTFE
Valve pallet DN 40 - 300 / 1½" - 12"A, C, E, FA, C, E, FB, D, G
Valve pallet DN 25 - 32 / 1" - 1¼"H, I, JH, I, J

Option: Housing with ECTFE-liningSpecial 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

Special materials upon requestFor higher set pressure or vacuum refer to type DZ/T-F

DZ/T
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 CL 150 R.F.
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:

In-line pressure or vacuum relief valve, standard design

DZ/T - –

In-line pressure or vacuum relief valve with heating jacket

DZ/T - H

In-line pressure or vacuum relief valve, standard design

DZ/T - –

In-line pressure or vacuum relief valve with heating jacket

DZ/T - 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/T-F
DZ/T
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). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.

DZ/T
Flow direction marked at the housing by ->
Detail X
Detail X
Tank connection for pressure relief function
Tank connection for vacuum relief function
DZ/T
Flow direction marked at the housing by ->
Detail X
Detail X
Tank connection for pressure relief function
Tank connection for vacuum relief function