Installation
The gate valve can be installed in horizontal or vertical piping.
For electrically actuated valves the axis of electric motor must
remain horizontal. If the servomotor is installed with vertical axis
upwards, amount of oil fill must be increased. If the valve is
installed horizontally, the actuator must be supported.
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Application
Shut-off valve for water, steam, gases and
other non-aggressive liquids used in energy
and chemical equipment for service pressures
and temperatures (depending on valve
material):
The gate valve is not suitable for flow regulation
Technical description
The yoke gate valve has a rising non-rotating
stem with its thread outside the valve
chamber. The stem nut is turned to raise or
lower the stem and flexible wedge. Seats and
wedge have hard welded alloy sealing
surfaces. The seats are pressed and welded
into valve body. Stem is sealed with gland
packing in a self-sealing bonnet.
Connecting and face-to-face dimensions
Flange connection dimensions as per
ČSN 13 1060 and ČSN 13 1061. Basic
connecting and face-to-face dimensions are
shown in the table.
Material
Body, bonnet, wedge 11 416
Stem stainless steel (13 Cr)
Seat 11 416
Sealing surfaces (weld deposit) stellite 6
Gland packing asbestos-free graphite
Testing
The gate valve is tested per ČSN 13 3060,
part 2, leakage grade 2.
Operation
The gate valve can be operated by el.
servomotor, handwheel or from a stand. The
gate valve cannot be operated without bypass
when max. differential pressure acc. to the
table is reached.
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