Butterfly Check Valves

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.
Compared to the existing swing type check valve, the face-to-face distance is shorter, so there are fewer restrictions on the installation space.
According to the user's request, it is possible to apply a fully-closing check valve with a dash-pot attached to prevent abrupt closing due to backflow.
Bypass valve or weight can be applied according to the user's requirement.

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

Type 1 : 0.44MPa (4.5㎏/㎠)
Type 2 : 0.74MPa (7.5㎏/㎠)
Type 3 : 0.98MPa (10㎏/㎠)
High pressure of up to 1.57MPa(16㎏/㎠) or higher is possible according to customer's request.

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	Ductile Iron	GCD450
		Steel Structure	SS400
		Stainless Steel Casting	SSC13
		Steel Casting	SC410
2	Disc	Ductile Iron	GCD 450
		Steel Structure	SS400
		Stainless Steel Casting	SSC13
		Steel Casting	SC410
3	Body seat	Stainless Steel	STS304
3	Body seat	Bronze casting	BC6
4	Disc seat	Rubber goods for water works	NBR/EPDM
5	Valve Seat	Stainless Steel	STS304

External Dimensions

**Swing Check Valves Dimensions** / Unit : mm
Nominal Diameter	L	Flange					*A1	*A2 (Fully Closed)	*A3 (Directly Closed)	*H1	X	Y	n-ØH
Nominal Diameter	L	ØD	ØC	ØG	n-Øh	T × f	*A1	*A2 (Fully Closed)	*A3 (Directly Closed)	*H1	X	Y	n-ØH
200	300	342	295	264	8-23	22 × 2	150	270	200	160	-	-	-
250	380	410	350	319	12-23	24 × 3	180	310	250	200	-	-	-
300	400	464	400	367	12-23	24 × 3	230	350	280	250	-	-	-
350	430	530	460	427	16-23	26 × 3	270	390	340	290	-	-	-
400	490	582	515	477	16-27	26 × 3	320	430	400	350	-	-	-
450	500	652	565	518	20-27	28 × 3	380	480	470	390	-	-	-
500	530	706	620	582	20-27	28 × 3	430	530	510	400	500	160	4-23
600	560	810	725	682	20-30	30 × 3	500	620	590	450	600	180	4-23
700	610	728	840	797	24-30	32 × 3	610	700	660	600	640	200	4-23
800	690	1034	950	904	24-33	34 × 3	670	750	710	550	800	230	4-23
900	740	1156	1050	1004	28-33	36 × 3	730	790	750	600	900	240	4-27
1000	770	1262	1160	1111	28-36	38 × 3	840	840	800	650	1000	250	4-27
1100	800	1366	1270	1200	32-36	41 × 3	950	950	910	700	1100	260	4-27
1200	820	1470	1387	1304	32-36	43 × 3	950	1040	1000	750	1080	270	4-27
1350	850	1642	1552	1462	36-40	45 × 3	1060	1210	1160	825	1350	280	4-33
1500	900	1800	1710	1462	36-40	48 × 3	1150	1330	1280	920	1500	300	4-33
1600	920	1950	1870	1770	40-40	53 × 3	1270	1440	1380	970	1600	300	4-33
1650	920	1950	1870	1770	40-40	53 × 3	1330	1510	1460	1010	1650	300	4-33
1800	950	2115	2020	1960	44-49	55 × 3	1470	1670	1590	1090	1800	300	4-33
2000	980	2325	2230	2170	48-49	58 × 4	1590	1830	1780	1150	2000	300	4-42

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.