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 2112 flanged cast iron wedge gate valve, with the installation length according
to BS 5163-1
- full smooth walled bore design
- wedge (closure) embedded in 100% pure elastomer
- non-rising spindle
- stem head-type seal in valve cover (O-rings)
1.2 USE
The gate valves with soft seals are intended for water supply systems, especially for potable water,
sewage systems, and industrial processing systems. The valves are intended for surface and underground
systems and must be installed in horizontal pipelines.
1.3 TECHNICAL SPECIFICATION
The gate valves with soft seals are intended for transporting potable or industrial water and other
liquids (if approved by the manufacturer).
- temperature range: -10
°
C to +70
°
C
- nominal diameter range: DN40 – 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.
•
The valve connection flange design is acc. to EN 1092-2
•
with the sizes compliant with the nominal pressure values.
-
The installation length and its tolerance is acc. to EN 558
Series 3 - TYPE 2112
•
Nominal pressure PN values:
0.6 MPa
1.0 MPa
1.6 MPa
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
Type 2112 gate valves with soft seals manufactured by F.A. „JAFAR”S.A. feature a smooth walled bore, a
non-ring spindle, 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 stem seal is provided 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 over
the flange is secured against loosening with a wire spring ring. The valve cover to body joints is made with hex
