OPERATION AND MAINTENANCE MANUAL
01-2016
5
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
F.A. JAFAR S.A manufactures the TYPE 5220, 5320 & 5321 water ball valves, with the TYPE 5220 full bore
valves and the TYPE 5320 & 5321 reduced bore valves. The valve body is a welded structure with a free-floating
ball up to DN200 (larger sizes have trunnion balls), an internal compensation system, and a closure seal in the
form of a ball set in a seat, made by two seals. The ball seals are supported with disk springs to ensure continuous
pressure of the seals on the ball, even when the ball valve is operated at varying temperatures, and compensate the
thermal expansion of the valve. The chromium steel spindle, interfaced with the ball, is sealed within the valve
body by o-rings located on the cylindrical surface, and a Teflon seal on the conical surface. A manual control lever
is mounted on the valve spindle and formed as a steel handle coated with a plastic material; another form is a
mechanical drive gear. The turning angle limiter ensures proper positioning of the ball closure in the fully open
and fully closed positions. The ball valve is fully open with the control lever in parallel to the valve centreline, and
fully closed with the control level square to the valve centreline.
Ends:
-
TYPE
5220
&
5320
flanged
ends
are
designed
per
PN-EN
1092-1:2013
and PN-EN 1092-2:1999;
- TYPE 5321 welded ends are designed per PN-EN 12627:2002.
2.2 MATERIALS
The tables below list the structural materials of the TYPE 5120, 5121, 5124, 5220, 5320 & 5321 ball valves.
TYPE 5220
Item
Part designation
Material
Reference standard
1
Body
Steel grade 1.0582
Steel grade 1.0037
Cast-iron, EN-GJS-400-
15
PN-EN ISO 3183:2013
PN-EN 10025-2:2007
PN-EN 1563:2012
2
Ball
Steel grade 1.4301
PN-EN 10088-1: 2014
3
Spindle
Steel grade 1.4021
PN-EN 10088-1: 2014
4
Screw plug
Steel grade 1.0037 + Zn
PN-EN 10025-2:2007
5
Ball seal
PTFE+C
PN-EN ISO 13000-1:2007
6
Turn limiter
Steel grade 1.4301
PN-EN 10088-1: 2014
7
Spindle seal
PTFE+C
PN-EN ISO 13000-1:2007
8
9
O-ring
EPDM, VITON
PN-ISO 1629:2005
10
11
Retaining ring
PN-81/M-85111
