OPERATION AND MAINTENANCE MANUAL
12-2015
4
nut on the wedge lug. The top section of the valve cover is the gland packing unit which keeps the flow control
head sealed. The gate valve stem is a cylindrical shaft tipped with a trapezoid thread at the bottom, which is the
drive section, whereas the top tip is designed to match the control element. The valve cover is bolted tight to the
valve body. The valve cover to body seal is an asbestos-free formed gasket. All inner and outer cast-iron surfaces
of the valve are polyvinyl coated. The type 2109 spindle is driven with a hand wheel, and the type 2909 valve is
switched with a drive actuator.
2.2 MATERIALS
The table below lists the structural materials of the metal seated gland packed wedge gate valves with soft
seals.
Item Part designation
Material
Reference standard
1
Body
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
2
Cover
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
3
Wedge
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
4
Packing gland
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
5
Spindle
Steel grade 1.4021
PN-EN 10088-1: 2014
6
Gland
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
7
Spindle nut
Spheroidal cast-iron, EN-GJS 400-15,
EN-GJS 500-7
PN-EN 1563: 2012
8
Seal
Carbon seal, DN40-DN300: PTFE +
carbon; DN350 DN600
acc. to manufacturer's
Technical Guidelines
9
O-ring seal
Steel grade 1.4021
PN-EN 10088-1: 2014
10
Handwheel
Grey cast iron, EN-GJS 250
PN-EN 1561: 2012
11
Valve cover gasket
Asbestos-free carbon gasket, DN40-
DN300; AF300 – DN350-DN600
acc. to manufacturer's
Technical Guidelines
12
Bolt
Steel, 1.0038 – DN40-DN300: Fe/Zn5
– DN350-DN600
PN-EN ISO 4017:2011
13
Nut
Steel, 1.0038 – DN40-DN300: Fe/Zn5
– DN350-DN600
PN-EN ISO 4032:2013
