WV/T

WV/T

Change-Over Valve

Function and Description

PROTEGO® change-over valves type WV/T are mainly used together with other valves or safety devices (e.g. PROTEGO®flame arresters) on cryogenic storage tanks and on tanks in process plants of chemical, petrochemical and pharmaceutical industries. They increase the operating safety of the technical equipment to be protected because each valve or safety device can be checked, maintained or repaired without any service break-down.

The valves mainly consist of housing (1) with flange connections DN 1 and two lateral connection elbows (3, 4) with flange connections DN 2 and the valve disc (2). If necessary it is possible to displace and turn the connection elbows. The valve seats (9, 10) are replaceable. The valve disc with metallic sealing surface is movable on the valve spindle (6). This ensures good adjustment to the valve seats even with high temperature differences. The sealing between valve disc and valve spindle is provided by an O-ring. The valve spindle is guided by bearing bushings; to the outside it is sealed by an adjustable packing (7).

The change-over valve allows the operator to block one valve or safety device at a time by operating the hand wheel (8). In normal operation the valve disc is in central position and the gas/liquid f ows through the two connection elbows. By turning the hand wheel to the stop, one of the connection elbows (3 or 4) is blocked while the other one remains open. The actual position of the valve disc can be identified from the position indicator (5) displayed on the valve spindle.

Depending on the requirements, the change-over valve in normal operation can be in mid-position or in end position: Midposition, e.g. when a high capacity of relief is required through emergency relief valves controlled in parallel, or end position, e.g. in case of flame arresters which, controlled in parallel, can be used or cleaned alternately as necessary.

Due to their design and appropriately selected materials the valves are distinguished by their high functional safety and very good flow rates. All elements that affect the function are made out of stainless steel.

Because of the variable nozzle positions the design of the PROTEGO® change-over valves WV/T facilitates connection of valves or other safety devices both with angle or straight through connection without additional adaptors.

Change-over valves of type WV/T stand out by their simple design, easy handling, the option of quick replacement of components that effect the function and consequently by their excellent availability and operational reliability. The lapped metallic sealing surfaces ensure a high degree of tightness even in low temperature ranges.

These valves are not flame transmission proof and do not refer to the European Explosion Protection Directive 94/9/EC, even if installed in explosive atmospheres. A hazard analysis (which considers the material selection and function of the device) shows that the device doesn’t have any potential sources of ignition.

Dimensions

DN1 80 / 3" 100 / 4" 150 / 6" 200 / 8" 200 / 8" 250 / 10" 300 / 12"
DN280 / 3"100 / 4"150 / 6"150 / 6"200 / 8"250 / 10"300 / 12"
a780 / 30.71780 / 30.71960 / 37.80960 / 37.801130 / 46.121450 / 57.091650 / 64.96
b250 / 9.84250 / 9.84310 / 12.20310 / 12.20330 / 13.47360 / 14.17415 / 16.34
c *303 / 11.93205 / 8.07285 / 11.22285 / 11.22367 / 14.98450 / 17.72525 / 20.67
c **323 / 12.72230 / 9.06317 / 12.48317 / 12.48407 / 16.02483 / 19.01571 / 22.48
d273 / 10.75273 / 10.75324 / 12.76324 / 12.76355 / 14.49457 / 17.99500 / 19.68
e250 / 9.84250 / 9.84250 / 9.84250 / 9.84400 / 16.33400 / 15.75500 / 19.68
f905 / 35.63905 / 35.631070 / 42.131070 / 42.131080 / 42.521515 / 59.651655 / 59.65
fmin810 / 31.89810 / 31.89950 / 37.40950 / 37.401170 / 47.761360 / 53.541470 / 57.87
fmax995 / 39.17995 / 39.171190 / 46.851190 / 46.851310 / 53.471695 / 66.732015 / 79.33
DN1 80 / 3" 100 / 4" 150 / 6" 200 / 8" 200 / 8" 250 / 10" 300 / 12"
DN280 / 3"100 / 4"150 / 6"150 / 6"200 / 8"250 / 10"300 / 12"
a780 / 30.71780 / 30.71960 / 37.80960 / 37.801130 / 46.121450 / 57.091650 / 64.96
b250 / 9.84250 / 9.84310 / 12.20310 / 12.20330 / 13.47360 / 14.17415 / 16.34
c *303 / 11.93205 / 8.07285 / 11.22285 / 11.22367 / 14.98450 / 17.72525 / 20.67
c **323 / 12.72230 / 9.06317 / 12.48317 / 12.48407 / 16.02483 / 19.01571 / 22.48
d273 / 10.75273 / 10.75324 / 12.76324 / 12.76355 / 14.49457 / 17.99500 / 19.68
e250 / 9.84250 / 9.84250 / 9.84250 / 9.84400 / 16.33400 / 15.75500 / 19.68
f905 / 35.63905 / 35.631070 / 42.131070 / 42.131080 / 42.521515 / 59.651655 / 59.65
fmin810 / 31.89810 / 31.89950 / 37.40950 / 37.401170 / 47.761360 / 53.541470 / 57.87
fmax995 / 39.17995 / 39.171190 / 46.851190 / 46.851310 / 53.471695 / 66.732015 / 79.33

Dimensions in mm / inches * for connection flange DIN PN16 resp. from DN 200 DIN PN 10
** for connection flange ANSI 150 lbs

WV/T

Material selection

DesignAB
Housing and connection elbowsSteelStainless Steel
Valve discHastelloyHastelloy
PackingPTFEPTFE
Spindle sealingFPMFPM
HandwheelSteelSteel
DesignAB
Housing and connection elbowsSteelStainless Steel
Valve discHastelloyHastelloy
PackingPTFEPTFE
Spindle sealingFPMFPM
HandwheelSteelSteel

The connection flange material must be compatible to the material of the plant component. Special models of change-over valves are available for specific requirements.

WV/T

Data Necessary for Specification

Stored medium
Service temperature (°C or °F)
Operating pressure (bar or psi)
Tank material
Tank nozzle DN1 (mm or inches)
Tank nozzle DN2 (mm or inches)
Position of nozzle I, II or III

Selection and Design

Together with the customer our engineers design and specify the valve for the specific case. The relevant plant specification is taken into account when defining the required nominal sizes and connection types. In standard versions the maximum allowable service temperature is +200°C / 392°F under a maximum allowable operating pressure of 6 bar / 87 psi. The device must have sufficient corrosion resistance with regard to the media to be stored or transported. If necessary, designs in special stainlesssteel quality should be selected.

Flange connection type

EN 1092-1, Form B1 or DIN 2501, Form C, PN 16 , ab DN 200 PN 10EN or DIN
ASME B16.5; 150 lbs RFSFASME
EN 1092-1, Form B1 or DIN 2501, Form C, PN 16 , ab DN 200 PN 10EN or DIN
ASME B16.5; 150 lbs RFSFASME

Other types upon request

Design Types and Specifications

Special devices in heatable design can be used under specific operating conditions:
with crystallizing products or products which tend to form deposits that affect the function
in use under extreme weather conditions in winter (frost), when product vapour might condensate in the undercooled valve, so ice bridges could develop, which could probly block the valve disc
with crystallizing products or products which tend to form deposits that affect the function
in use under extreme weather conditions in winter (frost), when product vapour might condensate in the undercooled valve, so ice bridges could develop, which could probly block the valve disc
WV/T
WV/T
WV/T