Ductile Iron Dual Plate Wafer Type Check Valve, PN 16

1. Product Summary

Parameter	Specification
Product	Ductile Iron Dual Plate Wafer Type Check Valve, PN 16
Design standard	API 594
Material	Ductile Iron
Service	Water
Max working temperature	-18°C to 80°C

Design Reference Standard API 594
Wafer Type Design, to take lesser space than the conventional Check Valve
Being light in weight, is more rigid than the standard Swing Type Check Valve, which needs expensive foundation and special supports
Being cylindrical body, stresses are uniformly distributed
Much longer seat life because of S.S to Rubber contact
Less wear and tear of seat surfaces
End connections are designed to suit flanges drilled to ANSI B Class-125 / ASME B Class-150
Water hammering eﬀect is minimized in this design, since the closing of valve does not depend upon any back pressure or flow
Each plate being half of the size of the swing check valve disc, provides straight flow path oﬀering minimal resistance because of the spring’s assistance as closing of the valve initiates as soon as flow velocity dips below the designated minimum velocity

Test	Pressure
Shell	24 bar
Seat	17.6 bar

P.No.	Part	Material	Spec.	Qty.
1	Body	Ductile Iron	IS 1865 Gr. 400 / 15	1
2	Body Lining	Nitrile Rubber	IS 5192 – 1	1
3	Flap / Disc	Stainless Steel	ASTM A 351 Gr. CF8	2
4	Hinge Pin	Stainless Steel	ASTM A 276 Type 304	1
5	Stop Pin	Stainless Steel	ASTM A 276 Type 304	1
6	Spring	Stainless Steel	Type 304	–
7	Packing Washer PTFE – – – –	—	—	1
8	Packing Washer	Nitrile Rubber	IS : 5192-1	–
9	Retainer Plug	Carbon Steel	– – –	4