DV/ZW-F

Pressure and Vacuum Relief Valve, In-Line

Features

10% Technology

for minimum pressure increase up to full

Extreme Tightness

resulting in lowest possible losses and reduced environmental pollution

Optimum Pressure Maintenance

based on , is close to opening pressure for optimum pressure 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 hazardous areas

Sturdy Housing Design

(PN 10 and PN 16)

Spring Loading (Overpressure Side)

for high set pressures

Function and Description

Pressure and Vacuum Relief Valve with Flange Connection for a Vent Line

The PROTEGO® in-line valve DV/ZW-F is a state-of-the-art with flanged connections for use in a vent line. Typically, the valve is installed in the inbreathing and out-breathing lines of tanks, vessels, and process to protect against unallowable and underpressure. The valve prevents emission losses almost up to the set pressure and prevents air intake almost up to . It is designed in a way that if the set pressure is exceeded, the vapors are released into an exhaust pipe (e.g., ). If the set vacuum is exceeded, atmospheric air is pulled into the system. For structural reasons, the is one size smaller than the pressure valve pallet. Due to the springloaded design, higher set pressures can be achieved.

Full Lift Technology

The 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 inbreathing will start as soon as the differential pressure between the atmospheric pressure and the tank is greater than the set pressure of the vacuum valve pallet. The is maintained up to set pressure with a tightness that is above the normal standards due to our highly developed manufacturing technology.

Optimized Valve Design for Maximum Performance

This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), (3), or with an air cushion (2), in conjunction with a high quality FEP and a sturdy 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.

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 charts on the following pages

DN	40 / 1½“	50 / 2"	80 / 3"	100 / 4"	150 / 6"
a	280 / 11.02	280 / 11.02	340 / 13.39	390 / 15.35	520 / 20.47
b	85 / 3.35	85 / 3.35	125 / 4.92	140 / 5.51	185 / 7.28
c	210 / 8.27	210 / 8.27	280 / 11.02	310 / 12.20	390 / 15.35
d	565 / 22.24	565 / 22.24	675 / 26.57	805 / 31.69	1070 / 42.13

Dimensions in mm / inches

Larger sizes upon request

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

Material selection for housing

Design	A	B
Housing	Steel	Stainless Steel
Heating jacket (DV / ZW-F-H-...)	Steel	Stainless Steel
Valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed.	Stainless Steel	Stainless Steel
Gasket	PTFE	PTFE

Option: Housing with ECTFE- lining Lining Protective plastic lining with a defined minimum/maximum thickness to protect against aggressive mixtures (e.g., acid).

Special materials upon request

Material selection for pressure valve pallet

Design	A
Pressure range [mbar] [inch W.C.]	>+60 up to +500 >+24 up to +200
Valve pallet	Stainless Steel
Sealing	Metal to Metal
Spring Spring A spring is a spiral of wire which returns to its original shape after it is pressed or pulled.	Stainless Steel

Special materials upon request

For lower set pressure use type DV/ZW. Higher set pressure and lower set vacuum upon request.

Material selection for vacuum valve pallet

Design	A*	B*	C	D
Pressure range [mbar] [inch W.C.]	-3,5 up to -5,0 -1.4 up to -2.0	<-5,0 up to -14 <-2.0 up to -5.6	<-14 up to -35 <-5.6 up to -14	<-35 up to -50 <-14 up to -20
Valve pallet	Aluminium	Stainless Steel	Stainless Steel	Stainless Steel
Sealing	FEP	FEP	Metal to Metal	Metal to Metal

*by set pressure up to +150 mbar / inch W.C.

Special materials and lower set vacuum 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 pressure valve pallet is spring loaded, the vacuum valve pallet weight loaded. Lower set pressures for the pressure side are achieved through weight loaded type DV/ZW.
Two different designs are available:

In-line pressure and vacuum relief valve, standard designDV/ZW-F –

In-line pressure and vacuum relief valve with heating jacketDV/ZW-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).

Settings

Pressure:	+60 mbar	+500 mbar
	+24 inch W.C.	+200 inch W.C.
Vacuum:	-3.5 mbar	-50 mbar
	-1.4 inch W.C.	-20 inch W.C.
Vacuum:	-3.5 mbar	-14 mbar
	-1.4 inch W.C.	-5.6 inch W.C.

For lower set pressure refer to type DV/ZW.
Higher set pressure and 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”.