QF3247HRSpherical ball valve has good bi-directional cutting function, good sealing performance and service life. The main function of Zui hard impact ball valve is that it can not only seal well under forward pressure, but also seal well when reverse pressure or reverse pressure is greater than positive pressure.

Most of the valves in the pipe network system are mainly used to cut off and regulate the medium. These valves account for a large proportion in the whole system, have a large amount of consumption, and require the valves to be durable and cost-effective. At the same time, they should be able to adjust and cut off the medium when the medium is in forward flow, and prevent the medium backflow when the pressure difference is changed or repaired, that is, it has the function of two-way cut-off. At present, this part of the pipe network system, the main application of stop valve, gate valve, butterfly valve and ball valve. The globe valve and gate valve have good bi-directional shut-off function. The sealing performance and service life are both good. They are one of the originators of the valve. However, due to the congenital restriction of the truncation structure, the globe valve has large shape and large operating torque, so it is unable to produce large diameter. At present, the Zui size in the market is only dn400; the gate valve has no regulating function to regulate the flow, and there is a major risk of the gate falling off The gate valve is also difficult to manufacture and transport because of its huge shape and height. Compared with gate valve, butterfly valve has the characteristics of short opening and closing time, small pushing torque, small installation space and light weight. In some working conditions, butterfly valve is used instead of gate valve. But for a long time, the sealing performance of butterfly valve has not fully met the market requirements. In addition to the middle line rubber lined butterfly valve can be sealed in a certain pressure range, other structures are basically unidirectional flow. Due to the limitation of rubber, the middle line structure can not be popularized. After improvement, the bi-directional butterfly valve with stainless steel elastic plate structure has appeared in the market, but its price is high and its service life is limited. Ball valve with small flow resistance, long life and many other advantages, has been recognized by the market, but its price is high. At present, it is mainly used in oil, natural gas, gas and other media more important pipeline, in general pipe network, especially in water system. Valve application Zui is a huge general pipe network system. Is there any valve with superior performance, moderate price, bi-directional sealing and no diameter limitation? The answer is yes. With many years of design experience, the two-way flow hard impact hard ball valve is developed by combining the superior sealing performance of ball valve and the superior structural performance of butterfly valve. It has the practical advantages of bidirectional sealing, adjustable and long service life of ball valve, as well as the advantages of small volume and light weight of butterfly valve. In fact, it is an eccentric hemisphere valve with butterfly structure! The sealing principle combines the front seal of fixed ball valve and the forced seal of eccentric butterfly valve, so as to realize high and low pressure bidirectional cut-off. On the two covers of the sealing pair, advanced technologies such as space plasma spray painting, ether laser measurement and vacuum protection infiltration surfacing can be used to form gradient functional materials such as martensitic stainless steel, austenitic stainless steel, cemented carbide, cermet and artificial diamond. It can automatically align the center (self-adaptive), automatically cross and compensate for wear, automatically apply extremely high sealing pressure, and instantly close There is no friction between the sealing pairs when the valve is closed or opened instantaneously. When the valve core is opened, the color casting of the valve core continuously shrinks and retreats. When the valve core is closed, the color casting of the valve core expands and moves forward. The valve has a series of advantages, such as short structure, small volume, easy transportation, installation, maintenance and repair, reliable operation, etc., which has become a major technical revolution in the valve industry. With its superior cost performance ratio, the valve will inevitably lead to the reform of pipe network valves. It will make it possible for ordinary pipe network, especially water system pipe network, to enjoy the same high performance and high quality of high-end systems such as thermal power, gas and steam at medium and low prices!

1. Main types: the main types of the valve are: worm gear, electric, pneumatic, hydraulic, among which pneumatic valve and hydraulic valve are suitable for occasions with pressure air source and pressure liquid source. 2. Working principle: the sealing surface of valve core is cubic curved surface, and the sealing surface of valve seat is conic surface. At the sealing point, the seat surface is actually the section of the valve core cubic curved surface (see Figure), so its combination is perfect. It has the function of adaptation (automatic center positioning and overlapping) and compensation for wear. Since the rotation center deviates from the geometric center of the valve core, the actual effect of the spool body is constantly backward and inward when the valve core is opened, and the valve core body is constantly advancing and expanding outward when the valve core is closed. Its function is equivalent to the synthesis of half ball valve, gate valve, globe valve and butterfly valve. Open the diagram of different angles: the main function of the two-way flow valve is that it can not only seal well under the positive pressure, but also seal well when the reverse pressure or the reverse pressure is greater than the positive pressure. When the positive pressure acts, the medium pressure pushes the valve plate to move forward and the valve stem deforms. The sealing surface of the valve plate is close to the sealing surface of the valve seat to transmit pressure, which pushes the valve seat to the valve body step to make it well sealed. When the reverse pressure acts, the medium pressure pushes the valve plate to move backward, and the valve stem deforms. At the same time, the medium pressure pushes the sealing surface of the valve seat close to the sealing surface of the valve plate, transmitting pressure, and pushing the valve seat to the limit deformation position of the valve rod, so as to make it well sealed.

 The sealing performance of butterfly valve does not fully meet the market requirements. Except that the butterfly valve with rubber lining in the middle line can be sealed in two directions within a certain pressure range, other structures are basically unidirectional flow. Due to the limitation of rubber, the middle line structure can not be popularized. After improvement, the bi-directional butterfly valve with stainless steel elastic plate structure has appeared in the market, but its price is high and its service life is limited. The flow resistance of ball valve is small

Technical performance specification for two way flow hard impact ball valve
Nominal diameter（mm）	Nominal pressure（Mpa）	Test pressure（Mpa）			Applicable temperature（℃）	Applicable media
		Shell strength test	Forward sealing test	Reverse sealing test
DN50~3000mm	0.6	0.9	0.66	0.66	If not indicated as 0 ~ 80 ℃, 0 ~ 200 ℃ can be produced	Water, sewage, oil, etc
	1.0	1.5	1.1	1.1
	1.6	2.4	1.76	1.76
	2.5	3.75	2.76	2.76
	4.0	6.0	4.4	4.4

 

1. There shall be no reduction, elbow, bellows, etc. on the pipe within 1DN length before and after the valve.
2. If butterfly valve, hydraulic automatic valve, butterfly check valve or butterfly slow closing check valve are installed in the front and back of the valve, the distance between the two adjacent valves shall be no less than 1DN
3. When valve plate is assembled, installed, transported, maintained or disassembled, the sealing surface shall not be touched, and strict protection measures shall be taken
4. The valve plate shall be closed during assembly, transportation, installation and storage
5. If it is necessary to disassemble, pay attention not to damage the shaft sleeve to prevent the loss of cone and sleeve
6. After assembly, installation and maintenance, the metal chips, dirt and impurities in the valve shall be removed, and the sealing surface of surfacing welding shall be wiped clean
7. No matter horizontal or vertical installation, when the flow direction cannot be determined, when the valve is opened, the valve plate has a large face and the end faces the inlet direction;
8. If it is not used for a long time, please coat the sealing surface with grease or oil paper or wax paper.
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