OPERATION AND MAINTENANCE MANUAL
09-2015
3
1 TECHNICAL DESCRIPTION
1.1 PRODUCT DESIGNATION AND IDENTIFICATION
The subject of this Operation and Maintenance Manual is:
Type 6516 cast iron flanged check ball valve
- full bore design
- ball (closure) embedded in 100% pure elastomer
- valve cover o-ring seal
- cover flush-bolted to body
1.2 USE
The Type 6516 flanged check ball valves are intended for industrial installations, e.g. sewage
discharge, or water supply systems, e.g. for potable water. The valves are intended for overground and
underground installations as installed in vertical or horizontal pipelines.
The Type 6516 cast iron flanged check ball valves are intended for pumping systems.
1.3 TECHNICAL CHARACTERISTICS
The Type 6516 cast iron flanged check ball valve are designed to transport potable water, process
water (sewage) and other liquids as approved by the manufacturer.
- Operating temperature: -10
°
C to +70
°
C
- Available diameters (dimensions): - DN50 to DN500 [mm] for Type 6516 valves
- Maximum medium flow rate:
- liquid: max. 4 [m/s]
- nominal pressure ratings (PN):
- 1.0 MPa
- 1.6 MPa
Maximum opening break-off pressure at zero back pressure:
The Type 6516 valve connection flange design is acc. to PN-EN 1092-2: 1999 with the sizes compliant
with the nominal pressure values.
Installation length of (Type 6516) flange valves is acc. to PN-EN 558+A1: 2012, series 48.
2 DESIGN
2.1 DESCRIPTION OF THE VALVE DESIGN
F.A. „JAFAR” S.A. manufactures the Type 6516 (flanged) check ball valves for pumping systems. The
valve features a cast iron body that houses a loose ball inside (the closure). The body chamber is closed from the
top by a cast-iron cover that is sealed with an o-ring and bolted to the body with hex cap bolts which are flush
with the valve cover seats. The ball in the valve before installation is located in the lowest valve body part, i.e.
directly at the sealing seat and rests freely on the guides (or, if the valve installation orientation is horizontal, the
ball sits in the valve seat). In the operating conditions, the ball is held at the top position (under the valve cover)
by the dynamic force of the liquid stream, or in the closed position, where it seals off the valve seat under the
back pressure. All inner and outer cast-iron surfaces of the valve are epoxy powder coated.
The check ball valves for pumping systems have the ball density higher than water.
The valve can be custom ordered with a cleaning valve (B) or a standard cleanout hole (A).
DN [mm]
50
65
80
100
125
150
200
250
300
350
400
500
Pmax [MPa]
0.01
0.02
0.03
0.04
0.05
