Ductile Cast Iron 300X Slow-Closure Silent Check Valve

• Media: Water
• Standard: GB/BS/DIN
• Certification: ISO
• Temperature: Ordinary Temperature
• Connection: Flange
• Valve Seat: Single-Seat
• Model NO.: 300x
• Structure: Diaphragm
• Material: Cast Iron
• Transport Package: Wooden Case
• Specification: DN40-DN500
• Trademark: ZJ
• Origin: China

Product Description

Ductile Cast Iron 300X Slow-Closure Silent Check Valve 
The 300X slow-closing check valve consists of main valve, one-way valve, needle valve, ball valve, micro-filter and pressure gauge. Using hydraulic automatic operation, the main valve can get the best opening or closing speed. To prevent the water hammer from hitting, we can achieve the effect of slow closing and silencing.

This product uses hydraulic self-control, does not need other devices and energy, easy maintenance, open and slow shut smoothly.

This series of valve products are widely used in high-rise buildings, living areas and other water supply network systems and urban water supply projects.

Working principle

When the valve feeds water from the inlet, the water enters the main valve control room through a micro filter, a needle valve and a one-way valve, and then drains downstream through a ball valve. Because the needle valve opening is less than the ball valve opening, that is, the main valve control room drainage speed is greater than the water intake speed, so the control room pressure reduces, acting on the lower end of the main valve disc inlet pressure open the main valve downstream water supply.
Materials:

Item	Part	Material
1	Body/Bonnet	Ductile IronEN GJS-500-7
2	Cover	Ductile IronEN GJS-500-7
3	Stem	AISI 304
4	Diaphgram	Nylon+EPDM
5	Support Ring	Ductile IronEN GJS-500-7
6	Obturator	Ductile IronEN GJS-500-7
7	Spring	AISI 304
8	O ring	NBR
9	Seat	AISI 304
10	V-Port	AISI 304
11	Nut	AISI 304
12	Seal Rings	NBR/EPDM

Data Sheet:

EN 588			EN 1092  PN10					EN 1092  PN 16					EN 1092  PN 25             Wet
DN	L	H	D	K	f	n	d	D	K	f	n	d	D	K	f	n	d	kg
50	230	139	165	125	19	4	99	165	125	19	4	99	165	125	19	4	99	14
65	290	159	185	145	19	4	118	185	145	19	4	118	185	145	19	4	118	19
80	310	179	200	60	19	8	132	200	160	19	8	132	200	160	19	8	132	23
100	350	214	220	180	19	8	156	220	180	19	8	156	235	190	23	8	156	33
150	480	333	285	240	23	8	211	285	240	23	8	211	300	250	28	8	211	70
200	600	407	340	295	23	8	266	340	295	23	12	266	360	310	28	8	274	128
250	730	476	395	350	23	12	319	405	355	28	12	319	425	370	31	12	330	210
300	850	526	445	400	23	12	370	460	410	28	12	370	485	430	31	12	389	280
400	1100	624	565	515	28	16	480	580	525	31	16	480	620	550	37	16	503	580
500	1250	720	670	620	28	20	582	715	650	34	20	609	730	660	37	20	609	900
600	1450	835	780	725	31	20	682	840	770	37	20	720	845	770	41	20	720	1250
800	1850	1110	1015	950	34	24	901	1025	950	41	24	901	1085	990	50	24	928	1560
1000	2250	1350	1230	1160	37	28	1112	1255	1170	44	28	1112	1320	1210	57	28	1140	2300