| Body |
Cast iron GG25 |
| Ductile Iron GGG40 |
| Stainless Steel CF8M/SS316 |
| Disc |
Stainless Steel SS316/SS304 |
| AL Bronze |
| Carbon Steel |
| Seat Gasket |
Rubber NBR/EPDM |
| Spring |
Stainless Steel |
| Axle |
Stainless Steel |
| Washer |
TEFLON |
| Main connection dimensions |
| Nominal diameter |
D |
D1 |
R |
L |
t |
D2 |
weight(kg) |
| DN(mm) |
NPS(inch) |
| 50 |
2' |
105(4.134) |
65(2.559) |
29.73(1.17) |
54(2.12) |
25(0.984) |
32.18(1.26) |
2,8 |
| 65 |
21/2" |
124(4.882) |
78(3.071) |
36.14(1.423) |
60(2.38) |
29.3(1.154) |
42.31(1.666) |
3 |
| 80 |
3" |
137(5.39) |
94(3.701) |
43.42(1.709) |
67(2.62) |
27.7(1.091) |
66.87(2.633) |
3.8 |
| 100 |
4" |
175(6.89) |
117(4.606) |
55.66(2.191) |
67(2.62) |
26.7(1.051) |
97.68(3.846) |
5.5 |
| 125 |
Lo |
187(7.362) |
145(5.709) |
67.68(2.665) |
83(3.25) |
38.6(1.52) |
111.19(4.378) |
7.4 |
| 150 |
9 |
222(8.74) |
171(6.732) |
78.64(3.096) |
95(3.75) |
46.3(1.823) |
127.13(5.005) |
10.9 |
| 200 |
8" |
279(10.984) |
222(8.740) |
102.5(4.035) |
127(5) |
66(2.598) |
161.8(6.370) |
22.5 |
| 250 |
10" |
340(13.386) |
276(10.866) |
126(4.961) |
140(5.5) |
70.7(2.783) |
213.6(8.490) |
36 |
| 300 |
12" |
410(16.142) |
327(12.874) |
154(6.063) |
181(7.12) |
102(4.016) |
237.9(9.366) |
54 |
| 350 |
14" |
451(17.756) |
375(14.764) |
179.9(7.083) |
184(7.25) |
89.2(3.512) |
312.5(12.303) |
80 |
| 400 |
16" |
514(20.236) |
416(16.378) |
198.4(7.811) |
191(7.5) |
92.5(3.642) |
351.0(13.819) |
116 |
| 450 |
18" |
549(21.614) |
467(18.386) |
226.2(8.906 |
203(8) |
96.2(3.787) |
409.4(16.118) |
138 |
| 500 |
20" |
606(23.858) |
514(20.236) |
248.2(9.72) |
213(8.374) |
102.7(4.043) |
451.9(17.791) |
175 |
| 600 |
24". |
718(28.268) |
616(24.252 |
297.4(11.709) |
222(8.75) |
107.3(4.224) |
554.7(21.839) |
239 |
| 750 |
30" |
884(34.8) |
772(30.39) |
374(14.724) |
305(12) |
150(5.905) |
685.2(26.976) |
659 |
Wafer Type Duo-check Valve is to avoid unwanted back flow in a pipe.
Applications:
Water supply systems ( distribution, treatment etc. ), irrigation, heating systems, ship building, industrial processes ( liquids and gases ).
Service Temperature;
EPDM -15 C degree to +120 C degree ( Allowable temperature in continuous use -5~ +100)
NBR -10 C degree to +90 C degree ( Allowable temperature in continuous use 0~ +80)
The Duo-check valve has been designed for installation in flanged piping systems ( PN10, PN16, AS 2129 Table "E" etc. ). Suitable gaskets shall be used for sealing between valve and flanges.
Design:
- The self acting pivoting check valve of the double disc.
- Maintenance free. The design is compact and space saving.
- The superior closing response prior to flow reveal.
- The corrosion resistant springs are designed to quickly close the valve at zero flow to prevent undesirable pressure surges.
In the closed position the valve is tight shut off.
- It opens automatically when the flow starts again.
- The elastomer seat is vulcanized and bonded to the body casting.
- It is out of the flow path thus ensuring extended seal life. Spherical profiling of the seat ensures positive shut-off even at low pressures
And the area adjacent to the seat is also protected by the same elastomer material.
- Attention paid to the streamlining of the flow path is paramount if good flow characteristics are to be achieved.
- The saving of energy costs by selecting a check valve may be several times the initial cost of the valve.
- The use of these design features together with careful material selection makes a product with a high reliability and a low operating costs.
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