Technical description
Body made of open-die forging, yoke welded from steel, joined by a bonnet joint sealed with a soft expanded graphite sealing ring. Seats pressed into the body and secured with a seal weld. Sealing surfaces of the seats and wedge hard-faced with a cobalt-free hard-facing alloy. Two-part stem packing with leak-off, made of expanded graphite. Remote operation via spur or bevel gear. Supplied according to special technical specifications.
Image gallery
Drawings and dimensions
Application
Shut-off valve: DN 800 gate valves for a design pressure of up to 11 MPa at a working medium temperature of up to 300 °C, intended for installation in the piping of the multiple forced circulation circuit of power units with RBMK reactors, in accordance with the General Technical Requirements VTP-87 as amended on 9 November 1991.
Operation
Testing
The gate valves are tested with demineralised water for strength and tightness at a minimum of 15 MPa, for operability and seat tightness at 10 MPa and Δp = 2.5 MPa. The body-to-flange weld is inspected by radiography and ultrasound.
Installation
The gate valves are installed in a vertical position with the actuator on top. Bidirectional flow.
Connection
Butt-welded according to ČSN and GOST standards.
Documentation
Materials of main parts
| Pos. | Part identification | Material | Pos. | Part identification | Material |
|---|---|---|---|---|---|
| 063 | Bearing | ČSN 024720 | 036 | Housing | 08X18H10T |
| 061 | Bearing | ČSN 024730 | 013 | Sealing cover | 11416 |
| 064 | Lubricator | ČSN 027410 | 033 | Stem nut | 11416 / 423046, 47 |
| 054 | Sealing ring | Exp. graphite | 012 | Yoke | 11416-12 022 |
| 095 | Seal | 015 | Stem | 14X17H2-17 134 | |
| 086 | Nut | 15 236.6 | Hard facing | ANTINIT DUR 500 | |
| 083 | Nut | 15 236.6 | 017 | Wedge | 22K |
| 048 | Nut | 12 020 15 320 | 014 | Cover | 22K |
| 081 | Screw | Hard facing | ANTINIT DUR 500 | ||
| 082 | Screw | 15 320 | 004 | Seat | 22K |
| 044 | Bolt | 15 320 | 001 | Body | 22K |
Dimensions
| DN/d | Pp (MPa) | D (max) | H | L | V | kg |
|---|---|---|---|---|---|---|
| 700/625 | ÷ 11 | 730 | 515 | 2060 | 3165 | 8300 |
| 800/625 | 840 | 2490 | 7950 |
Other
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