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 under pressure. 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.
Keywords
use
DZ/T
MAWV
MAWP
state
tanks
device
result
vessels
feature
research
mass flow
PTFE seal
tightness
commitment
tight seal
line valve
many years
valve body
Description
conjunction
development
performance
valve seats
art pressure
set pressure
The PROTEGO®
valve pallets
Line function
tank pressure
product losses
breathing lines
emission losses
sticky products
air cushion seal
10% overpressure
stable operation
corrosive fluids
process equipment
low-pressure valve
Vacuum Relief Valve
fluid dynamic design
conventional standard
Continuous investments
manufacturing technology
unallowable overpressure
unacceptable product entry
full lift type” technology
high quality FEP diaphragm
same opening characteristic
high quality stainless steel
high-pressure safety relief valve
maximum allowable working pressure
