DV/ZT-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 or Backflow Protection in Venting or Exhaust Lines

The PROTEGO® in-line valve DV/ZT-F is a state-of-the-art . Typically, the valve is installed in the in-breathing 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 unacceptable product entry 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. Due to our highly developed manufacturing technology, the is maintained up to set pressure with a tightness that is far above to the conventional standard.

Optimal 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 high quality FEP and a sturdy design. After the overpressure is released of 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

Dimensiones

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"	200 / 8"	250 / 10"
a	280 / 11.02	280 / 11.02	340 / 13.39	390 / 15.35	520 / 20.47	650 / 25.59	750 / 29.53
b	210 / 8.27	210 / 8.27	280 / 11.02	310 / 12.20	390 / 15.35	565 / 22.24	610 / 24.02
c	605 / 23.82	605 / 23.82	730 / 28.74	870 / 34.25	1170 / 46.06	1030 / 40.55	1335 / 52.56

Dimensiones en mm / pulgadas

Larger sizes upon request

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

Selección de materiales para la vivienda

Design	A	B
Housing	Steel	Stainless Steel
Heating jacket (DV / ZT-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

Selección de materiales para la válvula de presión

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/ZT. Higher set pressure and lower set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. upon request.

Selección de materiales para la válvula de vacío

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 <-2.0up to -5.6	<-14up to -35 <-5.6up to -14	<-35 up to -50 <-14up 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 / +60 Inch W.C.

Special materials and lower set vacuumupon request.

Tipo de bridas de conexión

EN 1092-1; Form B1

ASME B16.5 CL 150 R.F.

other types upon request

Modelo y especificación

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/ZT.
Two different designs are available:

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

In-line pressure and vacuum relief valve with heating jacketDV/ZT-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.
	>+60 mbar	+400 mbar
	>+24 inch W.C.	+160 inch W.C.
Vacuum:	-14 mbar	-50 mbar
	-5.6 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/ZT.
Higher set pressure and lower set vacuum upon request.

Diagrama de flujo volumétrico

Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.

Detail X

Detail Y

Tank connection

Applications