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コントローラー Jafar 2904のPDF 操作およびメンテナンスマニュアルをオンラインで閲覧またはダウンロードできます。Jafar 2904 11 ページ。 One-way knife gate valves with drive actuator
ページを印刷する1 TECHNICAL DESCRIPTION
1.1 PRODUCT DESIGNATION AND IDENTIFICATION
The subject of this Operation and Maintenance Manual is:
Type 2904 one-way flange-to-flange knife gate valve with drive actuator
- full bore design
- stainless steel knife (closer)
- available with rising or stationary spindle
- soft gland seal of the closer and the body
1.2 USE
The Type 2904 one-way flange-to-flange knife gate valves are intended for water supply systems, and
especially sewage systems, and industrial processing systems. The valves can be operated both in
underground (non-flooded sewers) and overground installations as installed in vertical or horizontal
pipelines.
1.3 TECHNICAL SPECIFICATION
The Type 2904 flange-to-flange knife gate valves are intended for transfer of potable water, process water
and sewage, as well as other liquids as approved by the manufacturer.
- Temperature: 0°C to +70°C
- Nominal diameter (dimension) range: DN50 to DN700 [mm]
- Maximum medium flow rate:
- The driving torque at opening start and closing end is as listed below:
DN
50
65
[mm]
Mmax
20
25
[Nm]
Valve control mode: the standard version of gate valve has the
clockwise closing sense of rotation.
The closing sense of rotation can be opposite on special order.
- The knife valves are designed for installation between flange end faces
acc. to PN-EN 1092-2: 1999 with bolt holes for the pressure rating of PN10.
Installation length: per the technical file, see Table 2 for sizes.
- Nominal pressure PN values: - per size:
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
The Type 2904 one-way flange-to-flange knife gate valves supplied by F.A. „JAFAR"S.A. feature a full
bore body, a stationary spindle (in the standard version) and an L-gasket closure seal embedded in a metal
enclosure. The body seal of the knife is a multi-layered packing compressed by a gland with bolts. The gland on
the delivered valve is loose and must be tightened before installation. The knife gate valve body is a monolithic
- liquid: max. 4 [m/s]
- gas: max. 30 [m/s]
80
100
125
150
30
30
50
60
OPERATION AND MAINTENANCE MANUAL
200
250
300
350
70
80
90
105
DN50 to DN250
DN300 to DN450
DN500 to DN600
DN700
400
450
500
600
120
160
180
210
- 1 MPa
- 0.7 MPa
- 0.4 MPa
- 0.25 MPa
03-2016
700
250
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