Shanghai: how to correctly understand the valve

- - - - - - - - - - - - : Shanghai instrument co. , LTD. , to teach you how to correctly understand the valve, to grasp the difference between each valve, in buying valve valve didn't know how I fit. The cut-off valve stem and valve seat sealing surface vertical axes. Open or close the valve stem travel relatively short, and very reliable cutting action, makes this valve very suitable for used as medium cut or adjust and throttling. Cut-off valve disc once in an open position, it is no longer the contact between the seat and clapper sealing surfaces, and have a very reliable cutting action, close to the valve is very suitable for used as medium cut or adjust and throttling. Disc polishing pillars plug connected to the stem, the seal is set in the column inserting two elastic sealing ring. Two elastic sealing ring with a set of rings is separated, and through the bonnet nut of load on the valve cover pressed around the plunger seal. Elastic sealing ring to replace, can use a variety of materials, the valve is mainly used for & other; Open & throughout; Or & other; Customs & throughout; , but with a special form of plunger or special thimble, can also be used to adjust flow. Once stop valve is fully open, it will no longer have a contact between the seat and clapper sealing surfaces, and thus its sealing surface mechanical wear and tear is small, because most of the cut-off valve seat and valve disc is easy to repair or replace the whole valve sealing components without removed from the pipeline, for the valve and pipeline welding into one occasion is very applicable. Flow direction of medium through the valve changed, so stop valve flow resistance was higher than that of other valves. Globe valve has the following several kinds of commonly used) The Angle type globe valve; Only need to change in Angle type cut-off valve, fluid direction at a time, so that through this valve pressure drop is smaller than conventional structure of the valve. ) Once-through globe valve; In once-through or y-shaped cut-off valve, the valve port from the mainstream way into a diagonal lines, so that the flow state damage than conventional cut-off valve, and pressure loss across the valve and the corresponding small. ) Plunger valve this form of cut-off valve is normal variant of globe valve. In the valve, the valve disc and seat is usually designed on the basis of the principle of plunger. Pneumatic butterfly valve butterfly plate installed on the diameter of the pipe direction. Cylindrical channels in butterfly valve body, disc disc around the axis of rotation, rotation Angle for & deg; ~° Between, rotate to & deg; When the valve is fully open. Electric butterfly valve has simple structure, small volume, light weight, only by a few parts. And just spin & deg; Can quick opening and closing, the operation is simple, at the same time, the valve has good flow control characteristics. Butterfly valve is in open position, the butterfly plate thickness is medium flows through the body's resistance, thus produced by the valve pressure drop is small, it has good flow control characteristics. Butterfly valves have a seal and metal seal two kinds of seal type. Elastic sealing valve, sealing ring can be embedded in the body or attached to the butterfly plate peripheral. Using metal seal valve generally live longer than elastic sealing valve, but it's hard to do. Metal sealing can adapt high working temperature, elastic seal has the defect of being limited by the temperature. If required butterfly valve used as flow control, mainly is the right choice of the size and type of valve. The structure and principles of butterfly valve is especially suitable for production of large diameter valves. Butterfly valve not only in the oil, gas, chemical industry, water treatment and other general industrial used widely, but also applied to the cooling water system of thermal power plants. Commonly used butterfly valve, which has two kinds of the wafer butterfly valve and flanged butterfly valve. Wafer butterfly valve with stud connection in place between two pipe flanges and flanged butterfly valve is a valve with flange, bolts on the valve flange connection on the pipe flange on both ends. Valves have a long history, China's valve industry has been trying to move on, using better materials to do better and more durable valves, superior low valve parker, worth your trust, we are your good partner.