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Butterfly Buffer Check Valve

Butterfly buffer check valve

Nominal pass through: 40～1400mm

Nominal pressure: 1.0～2.5MPa

Applicable medium: water, oil, sewage, seawater

Applicable temperature: 0～80℃ (up to 200℃ if necessary)

Flange standard: GB/T 17241.6 GB/T 9113

Test standard: GB/T 13927 AP1598

Butterfly buffer check valve product overview:

The check valve produced by our factory is mainly used at the pump outlet of industrial water supply and sewage treatment plant to prevent the backflow of the medium in the pipe network. Destructive water hammer is automatically eliminated so that pumps and piping are not damaged. The valve is mainly characterized by valve body, cutting flap and good buffer performance. It is the best product for industrial water and urban sewage.

Product details

Butterfly buffer check valves are used on the outlet of the water pump of industrial water supply and sludge treatment plant to prevent the medium inside the pipe network from going back, and remove automatically the destructive water hammer so as to ensure both pump and pipeline not to get damaged. It consists of body, disc, buffer and micro-adjusting valve. And it features by the brand new structure, small volume, small fluid resistance, reliable seal, wearable and good buffering performance. It is really the best product for industrial use of water and city sludge drainage.

Working principle and debugging:

Check valve is mainly composed of valve body, butterfly plate, regulating valve, and buffer cylinder. Buffer cylinder is also composed of two oil chambers, connected internally by a one-way valve, and externally connected by a regulating valve. When the valve is opened, the medium water pushes the butterfly plate.

At this time, the hydraulic oil in the buffer cylinder quickly flows from cavity 1 to cavity 2 through the check valve inside. When the valve is closed, the medium returns to the first cavity.

Due to the large impact force of the counterweight and the high pressure wave, the valve flap is mostly closed, and the oil in the second cavity is compressed at the same time. Normal opening of the regulating valve is only 1/3. The high pressure oil compressed in the 2 cavity can only flow slowly into the 1 cavity through this 1/3 area, so that the valve flap is slowly closed and the pressure of the water hammer peak is weakened. Limits the generation of destructive water hammer.

Due to the function of the above-mentioned regulating valve, the time for the hydraulic oil to flow from cavity 2 back to cavity 1 can be adjusted by adjusting its opening. That is to adjust the closing speed of the valve. Therefore, when the opening degree of the regulating valve is smaller, closing speed of the corresponding valve is slower. Then longer the water discharge, the smaller the water hammer, and vice versa. Users can adjust appropriately according to the needs of the scene.

Material:

Part Name

Valve body

Valve disc

Valve stem

Filler

Sealing ring

Material

Grey cast iron,

Cast steel

Grey cast iron,

Cast steel,

Ductile iron

Stainless steel

PTFE

Nitrile rubber

Pressure (MPa)	DN(mm)	L	D	D1	D2	b	Z- d	B1	B2	H
1.6	500	350	705	650	608	46	20-34	900	1000	980
	600	390	840	770	718	54	20-41	1090	1250	1070
	700	430	910	840	788	54	24-41	1200	1360	1220
	800	470	1020	950	898	54	24-41	1320	1480	1320
	900	510	1120	1050	998	54	28-41	1420	1580	1430
	1000	550	1255	1170	1110	60	28-48	1550	1700	1550
	1200	630	1485	1390	1325	66	32-54	1780	1950	1800
	1400	710	1685	1590	1525	72	36-54	2000	2175	1980
	1600	790	1930	1820	1750	78	40-58	2250	2470	2150
2.5	100	190	230	190	160	24	8-23	280	280	380
	125	200	270	220	188	28	8-25	310	310	440
	150	210	300	250	218	30	8-25	370	370	490
	200	230	360	310	278	34	12-25	540	600	550
	250	250	425	370	332	36	12-30	600	700	630
	300	270	485	430	390	40	16-30	650	740	690
	350	290	550	490	448	44	16-34	710	800	780
	400	310	610	550	505	48	16-34	770	870	860
	450	330	660	600	555	50	20-34	830	920	910
	500	350	730	660	610	52	20-41	900	1000	980
	600	390	840	770	718	56	20-41	1090	1250	1070
	700	430	955	875	815	60	24-48	1200	1360	1220
	800	470	1070	990	930	64	24-48	1320	1480	1320
	900	510	1180	1090	1025	66	28-54	1420	1580	1430
	1000	550	1305	1210	1140	68	28-58	1550	1700	1550
	1200	630	1525	1420	1350	72	32-58	1780	1950	1800
	1400	710	1750	1640	1560	78	36-65	2000	2175	1980