Polytetrafluoroethylene is also a polymer organic compound, which is called raw material before being sintered into products. It has a soft texture and also has a monolayer effect. A belt made of raw material is called a raw material belt and can be rolled into a plate for long-term storage. When in use, it can be freely formed, and any joint can form a uniform annular membrane that plays a sealing role as long as there is pressure. As a gasket between the valve body and valve cover in the valve, it can be pried open a gap without removing the valve disc or gate, and then stuffed with raw material to remove it. The compression force is small, and it does not stick to the hands or flange surface, making replacement very convenient. Suitable for mortise and groove flanges. PTFE raw materials can also be made into tube and rod shapes for sealing purposes. In people's impression, graphite is a brittle material that lacks elasticity and toughness, but after special treatment, graphite has a soft texture and good elasticity. In this way, the heat resistance and chemical stability of graphite can be displayed in the gasket material; Moreover, this type of gasket has a small compression force and an exceptionally superior sealing effect. This type of graphite can also be made into strips, which can be combined with metal strips to form high-performance spiral wound gaskets. The emergence of graphite plate sealing rings and graphite metal wound gaskets is a major breakthrough in high-temperature anti-corrosion sealing. This type of gasket has been widely produced and used abroad. Precautions for installing and using sealing rings: Do not install in the wrong direction or damage the lip edge.
The hardness of vulcanized rubber materials can immediately endanger the performance of products. For example, low hardness silicone sealing rings have good ductility, and many products require such low hardness and high elasticity materials; The PU polyurethane material rubber sealing ring has a very hard hardness and good wear resistance. Many products that require super wear resistance must be made of polyurethane material; For product development personnel, it is necessary to consider the hardness of vulcanized rubber products. As the material hardness of rubber sealing rings can immediately harm the engine compression ratio and performance of the product, the smaller the hardness, the worse the performance. On the contrary, the lower the hardness, the better the performance. Naturally, all of them are matched with the same vulcanized rubber material. When installing the low-pressure Y-shaped clamp cloth ring seal of the Herlet Hallite cleaning machine plunger pump, the seal, shaft, sealing chamber, and gland should be cleaned thoroughly.
Some seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common feature is that they have two lips in contact with the cylinder wall. There is a groove in the middle of the sealing part, which can store the medium, improve lubrication, reduce lip damage, and ensure reliable sealing. However, lip seals used in pneumatic systems require working without oil lubrication, contact pressure, and some integrate dust scraper and sealing components into a structure. The power sealing performance is reliable, cheap, and easy to maintain. It is suitable for conveying media with a large number of solid particles, such as slurry pumps and slurry pumps in the phosphoric acid industry. The requirements for machine accuracy of mechanical seals. The radial runout tolerance of the shaft (or sleeve) at the installation of the mechanical seal should not exceed 0.04-0.06mm. The axial displacement of the rotor shall not exceed 0.3mm.
The difference between piston seal and piston rod seal is: 1. Different sealing objects: piston seal refers to the seal between the cylinder block and the piston, while piston rod seal refers to the seal between the piston rod and the cylinder head. 2. The consequences are different: if the piston seal is not well sealed, it will affect the performance of the oil cylinder, and if the piston rod seal is not well sealed, it will leak oil. 3. The position of the sealing groove is different: the sealing groove of the piston seal is opened on the piston, and the sealing groove of the piston rod seal is opened on the hole. 4. The sealing rings used are different: the sealing ring for the piston seal is for the shaft, while the sealing ring for the piston rod seal is for the hole. A hydraulic cylinder is composed of a cylinder body, piston, piston rod, cylinder head, and sealing ring. The piston type hydraulic cylinder can be divided into two structures: single rod and double rod. Its fixing methods are fixed by the cylinder body and piston rod, and there are single acting and double acting according to the action of hydraulic pressure. In a single acting hydraulic cylinder, pressure oil is only supplied to one chamber of the cylinder, and the cylinder moves in one direction through hydraulic pressure, while the opposite direction movement is achieved through external forces such as spring force, self weight, or external load; The movement of the dual acting hydraulic cylinder piston in both directions is achieved by alternating oil injection through the two chambers, relying on the action of hydraulic pressure. The basic requirements for sealing are good sealing performance, safety and reliability, long service life, and should strive for compact structure, simple system, convenient manufacturing and maintenance, and low cost.
O-ring seal, also known as O-ring, O-ring, or O-ring, is a mechanical gasket in the shape of a circular ring. O-ring seal is a circular elastic body with a circular cross-section, usually fixed in a groove. During assembly, it is compressed by two or more components, resulting in a sealed interface. Due to its low price, simple manufacturing, reliable functionality, and simple installation requirements, O-ring is a common mechanical design for sealing. The O-ring withstands pressure of tens of pascals (thousands of pounds). O-ring seals can be used in static applications or dynamic applications where there is relative motion between components, such as rotating pump shafts and hydraulic cylinder pistons. When installing the lip shaped sealing ring, attention should be paid to the side facing the pressure oil. During the assembly process, uniform speed and pressure should be maintained to prevent the spring from falling off.
Sealing is a measure or measure to prevent fluid or solid particles from leaking from adjacent mating surfaces and to prevent external impurities such as dust from invading the internal parts of machine equipment.
A sealing ring is an original component or component that prevents leakage of liquid or solid particles from adjacent fusion surfaces and prevents external debris such as dust and water from invading mechanical equipment components. The sealing ring is a key component of construction machinery and equipment, and it is an indispensable component. In the engineering project machinery manufacturing industry, many hydraulic cylinders of equipment will use sealing rings, such as excavators, electric forklifts, forklifts, and tunneling machines, which will use sealing ring products. Whether it is airlines, ocean voyages, crude oil, chemical plants, mechanical equipment, power generation, metallurgical industry, mining, etc., all cannot do without sealing rings. Overall, all areas of organic chemistry, pumps, pipes, and valves depend on the sealing ring. Therefore, the sealing field involves a wide range of aspects.
Ningbo Dongheng Sealing Parts Co., Ltd. focuses on technological innovation and product research and development, and the development scale team continues to grow. The company currently has a large number of high-tech talents to continuously enhance its key competitiveness, accelerate technological innovation, and achieve stable production and operation. Honesty and trustworthiness are the requirements for business operations and also the basic principles of our conduct. The company is committed to creating top-notch hydraulic seals, pneumatic seals, rotary seals, and static seals. The company strives to provide customers with all kinds of good services. We believe that honesty, integrity, and pioneering spirit will bring common benefits and progress to both the company and individuals. After several years of development, it has become a well-known enterprise in the hydraulic sealing, pneumatic sealing, rotary sealing, and static sealing industries.
