Jafar 2903 Panduan Pengoperasian dan Pemeliharaan - Halaman 3
Jelajahi secara online atau unduh pdf Panduan Pengoperasian dan Pemeliharaan untuk Unit Kontrol Jafar 2903. Jafar 2903 10 halaman. Flange-to-flange gate valves with soft seals and pneumatic actuators
Halaman Cetak1 TECHNICAL DESCRIPTION
1.1 PRODUCT DESIGNATION AND IDENTIFICATION
The subject of this Operation and Maintenance Manual is:
Type 2901 and 2903 flange-to-flange wedge gate valves with soft seals and a pneumatic linear actuator.
- full smooth walled bore design
- wedge (closure) embedded in 100% pure elastomer
- rising spindle
- spindle head-type seal in valve cover (O-rings)
1.2 USE
The Type 2901 and 2903 cast iron flange-to-flange wedge 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 overground and underground (vaulted) systems and must be installed in horizontal pipelines.
1.3 TECHNICAL CHARACTERISTICS
The Type 2901 and 2903 flange-to-flange wedge gate valves with soft seals and a pneumatic linear
actuator are applied in transfer of potable water, process water and other liquids as approved by the
manufacturer.
- Operating temperature range: +70°C max.
- Nominal diameter (dimension) range: DN40 to DN400 [mm]
- Maximum medium flow rate:
- The driving torque at opening start and closing end is as listed below:
DN [mm]
40
Mmax [Nm]
- Valve control mode: pneumatic actuator.
- The valve connection flange design is acc. to PN-EN 1092-2: 1999
with the sizes compliant with the nominal pressure values.
- Special flanged connection for the pneumatic actuator.
- Installation length: PN-EN 558-1: 2012
- Nominal pressure ratings (PN):
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
Type 2901 and 2903 flange-to-flange wedge gate valves with soft seals and a pneumatic linear actuator
manufactured by F.A. „JAFAR" S.A. feature a smooth walled bore, a rising spindle, and an o-ring spindle seal
installed in a head-type valve cover. The spindle 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 spindle nut located on the wedge lug
and linked with the pneumatic actuator piston. The top part of the sealing plug is secured against loosening with a
wire spring ring. The valve cover to body joints is made with hex cap screws mounted flush with the valve cover
and preserved with a paraffin compound.
50
65
80
100
25
50
OPERATION AND MAINTENANCE MANUAL
- liquid: max. 4 [m/s]
- gas: max. 30 [m/s]
125
150
200
250
100
- 0.6 MPa
- 1.0 MPa
- 1.6 MPa
300
350
400
200
250
280
series 14 - Type 2901
series 15 - Type 2903
09-2015
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