screwjacks

  The spool ball of the floating ball valve moves between the two seat sealing rings with the help of medium pressure, while the spool ball of the trunnion mounted ball valve is connected with the valve stem and rotates around the center of the valve stem, and the floating seat support ring. Floating Ball Valve The ball of the floating ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the seal of the outlet end. The floating ball valve is small in size, light in weight, simple in structure and good in sealing performance. The load of the working medium that the ball bears is all transmitted to the outlet sealing ring, so it is necessary to consider whether the material of the sealing ring can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves. Trunnion Mounted Ball Valve The ball of the trunni...

The eccentric half ball valve has the advantages of rapid opening and closing, light weight, small flow resistance, wedge-shaped principle can be used to remove fouling when closing, and is convenient for air control and electric control, etc., and has been widely used in various industries. A new self-sealing structure of the sealing pair is designed for the application of the eccentric half ball valve under high temperature and high pressure conditions. Working Principle The center of rotation of the eccentric half ball valve body and the half ball body (that is, the axis of the valve stem) is offset by a radial dimension from the geometric center of the half ball sealing spherical surface, and also has an offset dimension from the sealing surface of the valve seat on the axis of the valve body channel. The eccentric half ball valve relies on two eccentrics to realize self-locking closure, and the reasonable selection of eccentrics makes the self-locking angle smaller than the fric...

  The globe valve is a valve that uses the valve stem to lift and drive the valve head, thereby changing the distance between the valve disc and the valve seat to achieve opening and closing control. The globe valve is the most widely used cut-off valve in chemical production. Globe valves are mainly used for the control of water, steam, compressed air and other pipelines in actual production, but they are not suitable for materials with high viscosity and easy crystallization. The structure of the globe valve is relatively simple, but the actual operation is simple and labor-saving, and it has a good performance in regulating the flow and cutting off the channel. The opening and closing speed is slow and there is little water hammer. The globe valve is compact in structure and has obvious characteristics in appearance. The top of the valve is equipped with a hand wheel and a valve stem, and the middle is provided with a thread and a stuffing box sealing section. The main way to j...

  The   plug valve   is a quick opening and closing valve. Plug valves are suitable for multi-channel structures, so one valve can obtain two, three or even four different flow channels. This can simplify the design of the pipeline system, reduce the amount of valves and connecting fittings. Plug valves can be divided into soft seal and hard seal structures according to different sealing materials. 1. Lift Soft Seal Plug Valve (1) Structural features ① The valve adopts soft sealing structure, with reliable sealing performance and zero leakage. ② During the opening and closing operation, there is no wear between the sealing surfaces. It has a long service life. ③ The valve has double blocking, double discharge and fire protection functions. ④ The valve is equipped with a pressure balancing device to prevent abnormal pressure rise of the system and reduce the resistance at the moment of opening and closing of the valve. ⑤ The opening and closing process is completed in two ...

  In the process of using the valve, we will encounter various working conditions, such as high temperature and low temperature. In this case, how should we choose the valve? 1. High Temperature Conditions When selecting valves, it is necessary to consider using shell materials and internals materials with high temperature strength, such as austenitic   stainless   steel   valve   and bidirectional stainless steel. The selected materials should not be bonded, plasticized and creep due to high temperature, the gap cannot not be too small. Applicable valve types include   gate valve ,   butterfly valve , etc. If the temperature has exceeded the temperature range that the metal can bear, the special valves with ceramic lining can be used, and the cooling jacket structure can also be used to keep the internal metal within the allowable stress range through circulating water cooling. 2. Low Temperature Conditions When the temperature is lower than - 29 ℃, l...

  The biggest difference between the   ball valve   and the   butterfly valve   is that the opening and closing parts of the butterfly valve are a plate, while the ball valve is a ball. Characteristics of Butterfly Valve: 1. Simple structure, low consumption and low cost, but poor tightness and bearing capacity; 2. Quick opening and closing, small flow resistance; 3. It is suitable for making large diameter valves; 4. In the cylindrical channel of the   butterfly valve   body, the disc shaped butterfly plate rotates around the axis with a rotation angle of 0 °~90 °. When the rotation angle reaches 90 °, the valve is fully open; 5. It can be used for media with suspended solid particles, and can also be used for powder and granular media according to the strength of its sealing surface; 6. It can be applied to the two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in the gas pipelines and waterways o...

  Plastic Ball Bearings are bearings which produce by plastic, such as POM,  PP , PEEK ，PE and PA rings ,for inside balls can be with stainless steel material ,glass balls . For some applications, the plastic bearings are better than metal bearings , the plastic bearings are  self-lubricating,chemical resistant,maintenance free,plastics bearings are cheaper than metals. Plastic bearings can be used in wet and corrosive environments, clean environments, areas that are difficult to lubricate, and applications that require non-magnetic bearings. Plastic bearings can used for packaging machinery, medical technology, semi-conductor manufacturing equipment, and other applications due to their unique advantages. MKL BEARINGS can produce different type of plastic bearings, we also can produce special plastic ball bearings.