Jafar 2502, Руководство по эксплуатации и обслуживанию

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OPERATION AND MAINTENANCE MANUAL 12-2016
4
hexagon socket head cap screws mounted flush with the valve cover and secured with paraffin compound. The
fastening bolts are either galvanized steel or stainless steel. 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 spindle is driven by a hand wheel.
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
Cast-iron, EN-GJS-400-15
EN-GJS-500-7
EN 1563
2 Cover
Cast-iron, EN-GJS-400-15
EN-GJS-500-7
EN 1563
3 Wedge
Cast-iron, EN-GJS-400-15
EN-GJS-500-7
Rubber, EPDM/NBR EN 1563
EN 1629
4 Skid Polyamide EN ISO 1874-1
5 Spindle Steel grade 1.4057 / 1.4021 EN 10088
6 Link
Grey cast-iron, EN-GJL-250
Polyethylene EN 1561
EN ISO 1872-1
7 Pointer
Brass
Polyethylene EN 1982
EN ISO 1872-1
8 Indicator dial Steel grade 1.4021 EN10088-1
9 Sealing plug Bronze, copper EN 1982
10 Spindle nut Bronze, copper EN 1982
11 Valve cover gasket Rubber: EPDM/NBR ISO 1629
12 O-ring Rubber: EPDM/NBR ISO 1629
13 O-ring Rubber: EPDM/NBR ISO 1629
14 Bolt Steel, Fe/Zn5, stainless steel EN ISO 4762
15 Bolt plug Paraffin
acc. to manufacturer's Technical
Guidelines
16 Washer Polyamide PA6 EN ISO 1874-1
17 Nut Steel, Fe/Zn5, or stainless steel EN ISO 4032
18 Set screw Stainless steel EN ISO 4027
19 Hand wheel Grey cast-iron, EN-GJL-250 EN 1561