PQ340HThe products of side mounted double eccentric hemisphere valve can be divided into six series according to their applications: general valve, pipeline valve, slurry valve, gas valve, Petrochemical valve and pulverized coal injection valve. Eccentric hemisphere valve transmission mode has manual, pneumatic, electric three kinds. Eccentric hemisphere valve is also known as C-type ball valve, which makes the valve unblocked or blocked by rotating hemisphere. Its switch is light, small volume, can be made into a large diameter, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface are often closed, not easy to be eroded by the medium. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc.

The double eccentric hemisphere valve drives the valve shaft to rotate 90 ° by means of driving mechanism. At this time, the eccentric disc (hemisphere) fixed on the valve shaft rotates 90 ° synchronously. Clockwise rotation, eccentric disc into the valve seat, under the eccentric action to form a wedge-shaped mechanism. The disc gradually compresses the valve seat to achieve sealing and close the valve. When the valve is rotated anticlockwise, the eccentric disc will quickly leave the valve seat, and the valve will be fully open when it is rotated 90 degrees.

1. The eccentric hemispherical valve solves the problems of slurry, mixed flow liquid, dust and other media in pipeline transportation, easy to scale and block, which makes the valve not close tightly.  
2. The eccentric hemispherical valve is easy to switch on and off. When it is opened, the ball is separated from the shell without any contact. The starting torque is small and the rotation is flexible. When the valve is closed, the squeeze cutting effect between the hemisphere and the valve seat can remove the dirt on the sealing surface, which makes the valve open and close smoothly with high safety factor and good sealing performance. 3. The eccentric structure of the sealing surface enables the spherical surface to automatically compensate for wear and maintain the sealing of the valve with long service life.  
4. The eccentric hemispherical valve T-type belongs to wear-resistant hard sealing ball valve. Its sealing pair material is special, and the sealing surface should be treated with special wear-resistant treatment. After treatment, the surface reaches HRC65-72 degrees, so the wear resistance of the valve is particularly good.  
5. Eccentric hemisphere valve surface paint, there are room temperature and high temperature two kinds. The imported paint with temperature resistance of 600 ℃ is used at high temperature. After spraying, the paint is not burnt, carbonized and coking at high temperature. No discoloration.

Manufacturing standard: gb12237-1989, ASME B16.34, API6D structure length: according to: gb12221, ASME B16.10
Dimensions of connecting end shall be in accordance with JB / t79, gb9113, hg20592; ASME. B-16.5a, ASME B16.25
Inspection and test shall be in accordance with JB / T 9092 and GB / t13927-1992 API598
Fire protection design according to api607;

The double eccentric hemispherical valve is the best equipment for conveying pulverized coal powder, control gas, granular fluid and solid medium with powder foam. It is a special valve for pulverized coal injection in metallurgy and mineral processing. This series of eccentric hemispherical valves are suitable for medium and low pressure pipeline systems in petroleum, chemical, metallurgy, electric power, light textile, papermaking, water conservancy and other departments, as well as for sewage treatment, steam, air, gas, sand slurry, pulp and other weakly turbid fluid medium transportation and interception, throttling, etc.

Main material list

name	texture of material
valve body	QT450、WCB、ZG20CrMo、ZG1Cr18Ni9Ti
Valve shaft	2Cr13、1Cr13
Disc	Alloy nitriding steel, nitriding stainless steel, wear-resistant steel
valve seat	Alloy nitriding steel, nitriding stainless steel, wear-resistant steel
Bearing	Aluminum bronze, Fz-1 composite
filler	Polytetrafluoroethylene, flexible graphite

 

Nominal pressure（Mpa）	0.6	1.0	1.6	2.5	4.0
Nominal diameter（mm）	40－1600	40－1600	40－1200	40－600	40－600
Sealing test pressure（Mpa）	0.66	1.1	1.76	2.75	4.4
Shell test pressure（Mpa）	0.9	1.5	2.4	3.75	6.0
Applicable temperature（℃）	－29～300、－29～425、－29～540
Applicable media	Water, sea water, sewage, acid and alkali liquid, slurry, steam, gas, oil
Driving mode	Manual, electric, pneumatic
Connection form	Flange connection, clamp connection

Installation mode

Vertical installation, horizontal installation

Nominal pressure PN/Mpa	Nominal diameter DN/mm	size（mm）								size（mm）
										L	D	K	d	f	C	Z-￠d	H
1.6	40									165	150	110	85	3	16	4-￠18
	50									178	165	125	100
	65									190	185	145	120		18		280
	80									203	200	160	135		20	8-￠18	320
	100									229	220	180	155				370
	125									254	250	210	185		22		430
	150									267	285	240	210		24	8-￠23	510
	200									292	340	295	265		26	12￠-23	600
	250									330	405	355	320		30	12-￠26	690
	300									502	460	410	375	4			760
	350									572	520	470	435		34	16-￠26	830
	400									610	580	525	485		36	16-￠30	925
	450									660	640	585	545		40	20-￠30	1025

 

	450	660							1025
	640	585	545		40				1120
	715	650	608		44	20-￠34			1210
	840	770	718	5	48	20-￠36