Micro resistance slow closing check valve

First, the product [micro resistance slow closing check valve] details:
Product Name: micro resistance slow closing check valve
Product features: the factory production of H47X, H4 7H, HH47X, HH47H, H47Xf, HDH47X type butterfly check valve is mainly used for punching a buried water supply, sewage treatment plant water pump outlet pipe to prevent medium countercurrent. Automatically eliminate destructive water hammer so as to ensure the pump and pipeline are not damaged. The valve is mainly composed of valve body, valve flap, buffer device and micro regulating valve. The product has the advantages of novel structure, small size, small fluid resistance, stable running, reliable and reliable, abrasion resistance, good buffering performance, etc., and is the best product of industrial water and urban sewage.

Part name	valve body	Butterfly plate	Seal ring	The stem	filler
Material Science	Gray cast iron carbon steel	Gray cast iron, cast steel, nodular cast iron	Nitrile rubber oil resistant, Chloride butyl rubber	Stainless steel	Teflon

Model	Nominal pressure PN(MPa)	Test pressure Ps(MPa)		Working pressure  P(MPa)	Medium temperature  (℃)	Applicable medium
		housing	Seal up
H47X、H47H、H47X、  H47H、H47Xf、HD47X	1.0	1.5	1.1	1.0	0-80℃	Water, oil Sea water and sewage

Micro resistance slow closing check valve main dimensions (flange connection size: PNl0, 16, 25 by JB / T79 94 standard) 

Nominal diameter DN(mm)	Size(mm)
	L	H	B1	B2
200	230	550	540	600
250	250	630	600	700
300	270	690	650	740
350	290	780	710	800
400	310	860	770	870
450	330	910	830	920
500	350	980	900	1000

Nominal diameter DN(mm)	Size(mm)
	L	H	B1	B2
600	390	1070	1090	1250
700	430	1220	1200	1360
800	470	1320	1320	1480
900	510	1430	1420	1580
1000	550	1550	1550	1700
1200	630	1800	1780	1950
1400	710	1980	2000	2175