OPERATION AND MAINTENANCE MANUAL
12-2016
3
1 TECHNICAL DESCRIPTION
1.1 PRODUCT DESIGNATION AND IDENTIFICATION
The subject of this Operation and Maintenance Manual is:
Type 2502 and 2511 gate valves with soft seals and opening indicator:
- full smooth walled bore design
- wedge (closure) embedded in 100% pure elastomer
- non-rising spindle
- stem head-type seal in valve cover (O-rings)
- with the valve closure position indicator
1.2 USE
The Type 2502 and 2511 gate valves with soft seals and opening indicator are intended for water
supply systems and industrial processing systems. The valves are intended for horizontal pipelines in
industrial systems.
1.3 TECHNICAL SPECIFICATION
The Type 2502 and 2511 gate valves with soft seals and position indicator are applied in transfer of
potable water, process water and other liquids as approved by the manufacturer.
- temperature range: -10
°
C to +70
°
C
- Nominal diameter (dimension) range: DN40 to DN300 [mm]
- Maximum medium flow rate:
- liquid: max. 4 [m/s]
- gas: max. 30 [m/s]
- The driving torque at opening start and closing end is as listed below:
DN [mm]
40 50 65 80
100
125
150
200
250
300
Mmax [Nm]
55
80
100
200
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.
- Installation length: EN 558-1
Series 14 - TYPE 2511
- Series 15 - TYPE 2502
- The valve connection flange design is acc. to EN 1092-2
with the sizes compliant with the nominal pressure values.
- 0.6 MPa
- 1.0 MPa
- 1.6 MPa
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
Type 2502 and 2511 gate valves with soft seals and position indicator manufactured by F.A. JAFAR S.A.
feature a smooth walled bore, a non-ring spindle atop of which is the valve closure position indicator installed,
and an o-ring spindle seal installed in a head-type valve cover. The stem is guided by a bushing in the valve cover
neck and a sealing plug. The spindle seal is effected by the plug sealing assembly, which is a system of O-rings.
The gate valve closure is a cast iron wedge completely coated with rubber and featuring a stem nut located on the
wedge lug. The stem is equipped with an interlocking collar installed by necking. From the bottom the stem
collar rests on a seat in the head via a bushing which acts as a sealed bearing. The plug is secured against
loosening with a wire spring ring located over the plug flange. The valve cover to body joint is made with
