Jafar 2005 Manuale di funzionamento e manutenzione - Pagina 3

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1 TECHNICAL DESCRIPTION

1.1 PRODUCT DESIGNATION AND IDENTIFICATION

The subject of this Operation and Maintenance Manual is:
Type 2005, 2905 two-way flange-to-flange knife gate valve
- full bore design
- stainless steel knife (closer)
- available with rising or stationary spindle
- soft gland seal of the closer and the body
- drive gear guard.

1.2 USE

The Type 2005, 2905 two-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 and overground installations as installed in vertical or horizontal pipelines.
CAUTION
Due to the limitations causes by application of specific materials in various operating
environment types, it is critical to precisely determine the operating conditions, i.e. the temperature,
pressure and medium characteristics. This will eliminate any problems during operation of the valve.

1.3 TECHNICAL CHARACTERISTICS

The 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.
- Operating temperature: to +70°C
- Nominal diameter (dimension) range: D50 to DN1000 [mm]
- Maximum medium flow rate:
- The driving torque at opening start and closing end is as listed below:
DN
40
50
65
[mm]
Mmax
20
20
25
[Nm]
- Valve control mode: the standard version of knife gate 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 for sizes.
- Nominal pressure PN values: - per size:

2 DESIGN

2.1 DESCRIPTION OF THE VALVE DESIGN

The Type 2005, 2905 two-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) or a rising spindle, the closure seal
with a square section with a knife guide and placed in the body seat. The knife seal is reinforced by a
stainless steel bar which prevents washing the seal from the seat. The body seal of the knife is a multi-
- liquid: max. 4 [m/s]
- gas: max. 30 [m/s]
80
100
125
150
200
30
40
50
55
55
DOKUMENTACJA TECHNICZNO RUCHOWA
250
300
350
400
450
60
80
105
150
160
DN40 to DN400 -
DN500 to DN600
DN700 to DN1000
500 600
700
800
900
200 280
480
510
600
1.0 MPa
- 0.6 MPa
- 0.25 MPa
03-2016
1000
680
3