Installation
The valve must be installed in vertical position With the thrust pin
above the disc.
Operation
Automatically operated by service pressure on the disc.
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Application
Safety valve designed to protect steam
boilers, pressure vessels and other pressure
equipment against exceeding specific
pressure level for steam, air, non-aggressive
liquids and gases for service pressures and
temperatures:
The lowest opening overpressure the valve
can be set for is 0,05 MPa for PN 40 and
2,00 MPa for PN 100.
Technical description
The non-enclosed design of the valve has a
raising lever for in-service testing of the
valve. The valve has no cover base for service
temperatures up to 200°C. Seat is pressed into
the body. There is a regulation ring screwed
into the seat to ensure that guaranteed
discharge can be set more precisely. Closing
disc (with additional functional surface) fits
the seat. The disc is pressed into the seat by a
thrust pin, which is forced down by a spring.
Flow direction in the valve is from under the
disc.
Connecting and face-to-end dimensions
Flange connecting dimensions as per
ČSN 13 1060, DIN 2501and ČSN 13 1061,
DIN 2526, sealing surface finish is for PN 40
(PN 100) on inlet side, for PN 16 on outlet
side. Basic face-to-end and connecting
dimensions are given in the table.
Material
Body, cover carbon steel (42 2643)
Top cover nodular cast iron (42 2304)
Disc, guide bush stainless steel (13 Cr)
Seat weld overlay (13 Cr)
Spring special steel
Testing
The valve is tested as per ČSN 13 3060, part 2
DIN 3230.
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