Flap Valves

It is attached to the outlet of the pipeline and is designed to automatically prevent backflow.
Check valves are used in pipelines for water supply and sewerage systems, and they play a role in protecting the pump or equipment on the pipeline by blocking the reverse flow that occurs when the pump stops operating.

Standard

200㎜ ~ 2,500㎜ (※ Small diameters of 200㎜ or less and large diameter of 2,500㎜ or more can be manufactured according to customer requirements.)

Working Pressure

Max. 0.98MPa (10㎏/㎠)

Valve Joint Part

Flange type, standard specifications are KS D3578, KS B 1511, and other specifications are applicable according to customer's request.

Working Fluid

Freshwater and seawater

Material
Dimensions

Main part material

No	Part Name	Material	KS
1	Body	Gray Cast Iron	GC20
1	Body	Steel Structure	SS41
2	Disc	Gray Cast Iron	GC20
2	Disc	Steel Structure	SS41
3	Pin	Stainless Steel	STS304, 403
4	Seat	Rubber goods for water works	NBR/EPDM

External Dimensions

**Flap Valves Dimensions** / Unit : mm
DN	Flange					Body			Remarks
	ØD	ØG	Bolt Hole		T × f	L	I	T / in
	ØD	ØG	ØC	n-Øh	T × f	L	I	T / in
200	340	264	395	8-23	14 × 2	190	150	5.8	1-Door
250	395	319	350	12-23	24 × 2	215	170	6.6
300	445	367	400	12-23	26 × 3	235	180	6.9
350	505	427	460	16-23	26 × 3	265	200	7.9
400	565	477	515	16-28	36 × 3	280	210	5
450	615	527	565	20-28	28 × 3	300	220	5
500	670	582	620	20-28	30 × 3	320	230	5
600	780	682	725	20-31	33 × 3	360	250	5
700	895	797	840	24-31	35 × 3	400	270	5
800	1015	904	950	24-34	37 × 3	425	280	6
900	1115	1004	1050	28-34	39 × 3	450	290	6
1000	1230	1111	1160	28-37	41 × 3	480	300	7	2-Door
1100	1340	1221	1270	32-37	41 × 3	500	305	8
1200	1470	1304	1387	32-37	43 × 3	525	310	9
1350	1642	1462	1552	36-42	45 × 3	565	325	10
1500	1800	1620	1710	36-42	48 × 3	610	340	11
1650	1950	1770	1860	40-48	50 × 6	655	360	15	4-Door
1800	2115	1960	2020	44-48	51 × 6	700	380	16
2000	2325	2170	2230	48-48	54 × 6	760	400	18
2200	2550	2370	2440	52-56	58 × 6	810	420	19
2400	2760	2570	2650	56-56	60 × 6	860	440	21
2500	2860	2670	2750	56-56	62 × 6	890	450	22

1. The flange is KS D 3578 F-12 standard, and other standards can be applied upon request.
2. The valve's face-to-face distance applies to the manufacturer's standard specifications.
3. * The displayed dimensions are for reference only.