300LB API Swing Check Valve

300LB API swing check valve is engineered to API 6D standards with a robust cast steel body and bolted bonnet design, delivering dependable backflow prevention for high-pressure pipeline systems. Featuring a heavy-duty swing disc mechanism with full bore construction, this valve ensures reliable performance and minimal pressure drop under demanding operating conditions. Optional lever-weight, spring or hydraulic damper assemblies are available.

Overview

Application : Widely used in high-pressure oil & gas transmission, refinery processes and petrochemical plants where Class 150 valves are insufficient. Also serves power generation high-pressure circuits and industrial piping systems requiring robust backflow protection. The preferred choice for critical high-pressure pipeline installations across the energy and process industries.

Material Specification:

Part Name	Material	Working Temperature
Valve nut	Carbon steel / Stainless steel	-196°C ~ 565°C
Shim	Carbon steel / Stainless steel
Rocker pin	Carbon steel / Stainless steel
Seal	CS+SS / SS / SS+STL (see body materials)
Discs	CS+SS / SS / SS+STL (see body materials)

Part Name	WCB	LCB	WC6	WC9	Applicable Medium
Inner six angle bolt	A193 Gr B7/A194 Gr 2H	A320 Gr L7/A194 Gr 4	A193 Gr B16/A194 Gr 4/7	A193 Gr B16/A194 Gr 4/7	Water, oil, gas, nitric acid, acetic acid
Middle flange bolt nut	A193 Gr B7/A194 Gr 2H	A320 Gr L7/A194 Gr 4	A193 Gr B16/A194 Gr 4/7	A193 Gr B16/A194 Gr 4/7
Shim	Spiral wound/soft iron	Spiral wound/soft iron	Spiral wound/SS304	Spiral wound/SS304
Bracket	A216 Gr WCB	A352 Gr LCB	A217 Gr WC6	A217 Gr WC9
Rocker arm	A216 Gr WCB	A352 Gr LCB	A217 Gr WC6	A217 Gr WC9
Valve cover	A216 Gr WCB	A352 Gr LCB	A217 Gr WC6	A217 Gr WC9
Body	A216 Gr WCB	A352 Gr LCB	A217 Gr WC6	A217 Gr WC9

Performance Specification:

Pressure Rating PN (MPa)

Strength Test

Water Seal Test

Air Tight Test

MPa

Lbf/in²

MPa

Lbf/in²

MPa

Lbf/in²

300

7.7

1110

5.7

815

0.4–0.7

60–100

Drawing:

Dimensions:

in	DN	LRF	LBW	D	D1	b	Z-Φd	A	B	H
2	50	267	267	165	127.0	21	8-19	60	52	180
2½	65	292	292	190	149.4	24	8-22	75	63	190
3	80	318	318	210	168.1	27	8-22	91	78	215
4	100	356	356	255	200.2	30	8-22	117	102	242
5	125	400	400	280	235.0	33	8-22	144	128	268
6	150	444	444	320	269.7	35	12-22	172	154	305
8	200	533	533	380	330.2	40	12-25	223	203	368
10	250	622	622	445	387.4	46	16-29	278	255	395
12	300	711	711	520	450.9	49	16-32	329	305	445
14	350	838	838	585	514.5	52	20-32	362	337	470
16	400	846	846	650	571.5	56	20-35	413	387	530
18	450	978	978	710	628.5	59	24-35	464	438	565
20	500	1016	1016	775	686	62	24-35	516	489	610
24	600	1346	1346	915	813	68	24-41	619	591	750