OPERATION AND MAINTENANCE MANUAL
12-2016
4
cap screws mounted flush with the valve cover and preserved with a paraffin compound. The valve cover to body
seal is a rubber gasket which also seals the bolt penetration points to prevent any leaks from their leads. All inner
and outer cast-iron surfaces of the valve are epoxy powder coated. The stem may be operated manually using a
hand wheel or, in case of gate valves located underground, through a hood and gate valve casing, using a T
socket.
2.2 MATERIALS
The table below lists the structural materials of the gate valves with soft seals.
Item Part designation
Material
Reference standard
1
Body
EN-GJS 400-15 cast iron
EN 1563
2
Cover
EN-GJS 400-15 cast iron
EN 1563
3
Wedge
EN-GJS 400-15 cast iron
Rubber: EPDM (or NBR)
EN 1563
ISO 1629
4
Skid
Polyamide
EN ISO 1874-1
5
Sealing plug
Brass
EN 1982
6
Safety ring
Steel grade 1.1260
74/H-84032
7
Cleaning seal
Rubber: EPDM (or NBR)
ISO 1629
8
Spindle nut
Brass
EN 1982
9
Spindle
Steel grade 1.4021
EN 10088-1
10
Valve cover gasket
Rubber: EPDM (or NBR)
ISO 1629
11
12
O-ring seal
Rubber: EPDM (or NBR)
ISO 1629
13
Bolt, cap,
hex
Acc. to reference standards
EN ISO 4762
14
Bolt plug
Paraffin
acc. to manufacturer's
Technical Guidelines
15
Washer
Polyamide PA6
EN ISO 1874-1
