The structure design of the side mounted eccentric hemisphere valve is similar to that of the three eccentric hard seal butterfly valve. The ball valve has the advantages of easy operation, no friction during opening, zero leakage and long service life. In addition, the valve can continue to be used by adjusting or replacing the sealing pair, which avoids the disadvantages of scrapping the whole set of valves due to sealing failure and saves cost.

The actuator (or wrench) drives the valve stem to force the ball of the closing part to rotate around the center a, and the ball moves from point B to point C. relative to the center point O of the valve, the trajectory from B to C is a cam like eccentricity. When the valve is turned right into the valve seat, the valve is closed and keeps good sealing. According to the cam principle, the force acting on the valve seat increases gradually from the opening to the closing of the valve The surface of the closing part is separated from the valve seat completely, and the sealing specific pressure is gradually increased until it is completely sealed, otherwise, it is open. See the figure below:

                          

                Working principle diagram                                                                                                       Equal percentage flow curve

1: The outer step of the valve seat is matched with the inner step of the valve body to prevent the ball and the valve seat from jamming or detaching;
2: When the eccentric valve body, eccentric ball, valve seat and valve rod are placed without movement, they are automatically centered in the common track, and the closer they are closed, the better the sealing performance is. Therefore, the sealing performance of the eccentric hemispherical valve is safe and reliable. When the valve is opened and closed, the ball and valve seat are completely separated. It eliminates the wear of the seal and overcomes the problem that the valve seat and the sealing surface of the traditional ball valve always wear
3: The non-metallic elastic material is embedded in the metal seat, and the metal sealing surface of the valve seat is well protected;
4: When the valve is fully open, the flow capacity is large, the pressure loss is small, and the medium will not deposit in the valve body;
5: Long service life, wear-resistant sealing pair, and compensation, valve seat can be adjusted or replaced.

Hemispherical valve products are divided into six series according to their applications: general valve, pipeline valve, slurry valve, gas valve, Petrochemical valve and pulverized coal injection valve. In petroleum, chemical industry, metallurgy, electric power, gas, ash discharge, coal powder injection and other industries, it is the replacement product of gate valve, globe valve, Y-type valve and ball valve.

Nominal diameter: dn50-1000 nominal pressure: pn1.0-10.0mpa

Valve body: WCB CF8 CF8M zg1cr18ni9ti
Ball: hard seal: zg1cr18ni9ti soft seal: CF8 / CF8M
Valve seat: hard seal: 2Cr13, 1Cr18Ni9Ti, soft seal: PTFE ppl
Working temperature: hard seal: - 40 ～ 425 ℃, soft seal: - 28 ～ 250 ℃

The design and manufacture are in accordance with API6D GB / t12237-1989
Test and inspection shall be in accordance with ap1598 JB / t9092-1999
Flange size GB / t9113-2000 JB / t79-1994 hg20592-1997
The structural length is as per kyv-2000

Nominal pressure	Maximum working pressure at normal temperature	Shell test pressure	Test pressure of airtight seal	High pressure seal test pressure
1.6	1.6	2.4	0.6	1.76
2.5	2.5	3.8	0.6	2.75
4.0	4.0	6.0	0.6	4.4
6.4	6.4	9.6	0.6	7.1
Class150	2.0	3.0	0.6	2.2
Class300	5.0	7.5	0.6	5.5

Shell material	Seat material	Suitable temperature	Applicable media
type	stainless steel	≤150℃	Water and steam Oil products, etc
	stainless steel	≤250℃
type	stainless steel	≤150℃	Nitric acid
	stainless steel	≤200℃
type	stainless steel	≤150℃	Acetic acid
	stainless steel	≤200℃
type	Cemented carbide	≤550℃	Steam, metallurgy Refining and energy

Body cover	GB	WCB		ZG1Cr18Ni9Ti		ZG0Cr18Ni12MoTi		ZG15Cr1Mo1v
	ASTM	WCB		CF8		CF8M		WC9
sphere	GB	ZG2Cr13		ZG1Cr18Ni9Ti/         Special surface treatment		ZG0Cr18Ni12MoTi          Special surface treatment		ZG15Cr1Mo1v          Special surface treatment
	ASTM	CA15		CF8+HF		CF8+HF		WC9+HF
Stem	GB	2Cr13		1Cr18Ni9Ti		0Cr18Ni12MoTi		25Cr2Mo2v
	ASTM	420		304		316		F22a
valve seat	GB	PTFE	2Cr13	PTFE	1Cr18Ni9Ti	PTFE	0Cr18Ni12MoTi	D517
	ASTM	PTFE	420	PTFE	304	PTFE	316	HF
filler	GB	PTFE	Flexible graphite	PTFE	Flexible graphite	PTFE	Flexible graphite	Flexible graphite
	ASTM	PTFE	Flexible graphite	PTFE	Flexible graphite	PTFE	Flexible graphite
Bolt	GB	25		0Cr18Ni9		0Cr18Ni9		15Cr1Mo1v
	ASTM	A193 B7		A320-B8		A320-B8		A193 B16
Nut	GB	45		0Cr18Ni9		0Cr18Ni9		20CrMo
	ASTM	A194 2H		A194-8		A194-8		A194-4

 

Nominal pressurePN	Nominal diameterDN	size（mm）Dimensions
		L	D	K	d	Y	b	Z-Φdo	Ws	Hs	Hw	Hd
1.6MPa	50	124	165	125	100	-	16	4-Φ18	230	164	260	310
	65	145	185	145	120	-	18	4-Φ18	250	180	275	330
	80	165	200	160	135	-	20	8-Φ18	300	200	300	360
	100	194	220	180	155	-	20	8-Φ18	320	235	335	390
	125	210	250	210	185	-	22	8-Φ18	400	260	335	405
	150	229	285	240	210	-	24	8-Φ23	500	280	375	440
	200	243	340	295	265	-	26	12-Φ23	800	320	410	470
	250	297	405	355	320	-	30	12-Φ25	100	355	485	550
	300	338	460	410	375	-	30	12-Φ25	1200	400	530	595
	350	400	520	470	435	-	34	16-Φ25	-	-	580	650
	400	400	580	525	485	-	36	16-Φ30	-	-	650	730
	450	502	640	585	545	-	40	20-Φ30	-	-	710	790
	500	533	715	650	608	-	44	20-Φ34	-	-	760	840
	600	686	840	770	718	-	48	20-Φ41	-	-	870	960
	700	762	910	840	788	-	50	24-Φ41	-	-	910	1080
	800	864	1025	950	898	-	52	24-Φ41	-	-	935	1125
	900	914	1125	1050	998	-	54	28-Φ41	-	-	995	1255
	1000		1255	1170	1110	-	56	28-Φ48	-	-	1080	1385
	1200		1485	1390	1325	-	58	32-Φ54	-	-	1175	1490
	1400		1685	1590	1525	-	60	36-Φ54	-	-	1280	1565
2.5MP	50	124	165	125	100	-	20	4-Φ18	230	164	260	310
	65	145	185	145	120	-	22	8-Φ18	250	180	275	330
	80	165	200	160	135	-	22	8-Φ18	300	200	300	360
	100	194	230	190	160	-	24	8-Φ23	320	235	335	390
	125	210	270	220	188	-	28	8-Φ25	400	260	355	405
	150	229	300	250	218	-	30	8-Φ25	500	280	375	440
	200	243	360	310	278	-	34	12-Φ25	800	320	410	470
	250	297	425	370	332	-	36	12-Φ30	1000	355	485	550
	300	338	485	430	390	-	40	16-Φ30	1200	400	530	595
	350	400	555	490	448	-	44	16-Φ34	-	-	580	650
	400	400	620	550	505	-	48	16-Φ34	-	-	650	730
	450	502	670	600	555	-	50	20-Φ34	-	-	710	790
	500	533	730	660	610	-	52	20-Φ41	-	-	760	840
	600	686	845	770	718	-	56	20-Φ41	-	-	870	960
	700	762	960	875	815	-	60	24-Φ48	-	-	990	1080
	800	864	1085	990	930	-	64	24-Φ48	-	-	935	1125
	900	914	1185	1090	1025	-	66	28-Φ54	-	-	995	1255
	1000		1320	1210	1140	-	68	28-Φ58	-	-	1080	1385
	1200		1520	1420	1350	-	72	32-Φ58	-	-	1175	1490
	1400		1755	1640	1560	-	78	36-Φ65	-	-	1280	1565

Note: due to the limitation of the number of words in the webpage, many sizes cannot be listed. If you have any requirements, please contact us at any time