one Gate valve is defined in the pipeline has wide range of USES, a valve main connect and block medium. Does not apply to regulate the flow of medium, but can according to the size of discretion to determine flow rate of valve rod ( Such as fire scale seal gate valves equipped with opening and closing of the elastic base seat) 。 Gate compared to other valves, pressure, temperature, diameter and other requirements of the applicable range wants wide. two Gate valve gate valve structure according to the internal structure of the different can be divided into: single wedge type gate type, flexible disc type, double disc type, parallel slide type. Depending on the valve stem stents can be divided into: rising stem gate valves and non-rising stem gate valves. 3. Body and the runner gate valve body structure decision and body connected to the pipe, valve body and bonnet, in terms of manufacturing methods, casting, forging, forging, welding, cast joint and tube sheet welding etc. Forging the body has to develop in the direction of large diameter, and casting the body gradually to the development of small diameter. Any kind of gate valve can be forged, cast, should be based on user requirements and the manufacturer with manufacturing methods. Port can be divided into the valve body, full size and reducing type two kinds. Runner diameter and nominal valve menstruation and basically the same for all sizes, Circulation pore size smaller than nominal valve is given. it is called reducing type. Reducing uniformly reducing evenly and reducing costs are two kinds. Flow in cone tube is a kind of non-uniform shrinkage, this kind of valve inlet side aperture is basically the same as the nominal diameter, then gradually narrowed, to seat down to a minimum. With reducing type port ( Whether the cone tube non-uniform reducing or even reducing) , its advantage is the same specifications of the valve, can reduce the size of the ram, opening and closing force and moment; The disadvantage is that flow resistance increases, the pressure drop and increase energy consumption, so the shrinkage cavity shoulds not be too big. For cone tube reducing, the seat of the ratio of the diameter and nominal diameter, usually take 0. 8 to 0. 95. Nominal diameter less than 250 mm of the reducing valve, the valve seat diameter than nominal diameter reduce a commonly; Nominal diameter equal to or greater than 300 mm of reducing valve, the valve seat diameter is generally lower leg than the nominal size. Four. Gate valve gate valve movements is closed, sealing surface can only rely on medium pressure to seal, that only depend on the medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, this is the seal. Most is adopt compulsory seal gate valve, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing. Exercise: gate valve gate, as a straight line with the stem, also called rising stem gate valves. Usually in lifting lever on the trapezoidal thread, through the valve at the top of the nut and guide groove on the valve body, the rotation movement into linear motion, which is the operating torque thrust into operation. Open valve, when the gate hoisting height is equal to valve size 1:1 times, fluid channels open completely, but at runtime, the position cannot be monitored. Actual use, is the stem apex as a sign, that is fixed position, as its full open position. To consider locking phenomenon in a temperature change, usually in the open to the vertex positions, pour 1/2-1 ring back, as the full open position of the valve. The valve fully open position, therefore, according to the location of the damper ( > the trip. Some gate valve stem nut in ram, hand wheel rotate to drive the valve stem, and make the damper to ascend, the valve is called rotating lever gate or non-rising stem gate valves. Five. Gate valve performance advantages 1. The valve fluid resistance small, because the valve body is straight type, medium flow does not change direction, therefore more other smaller valve flow resistance; 2. Sealing performance is better stop valve, opening and closing is cut-off valve and effort; 3. Applicable scope is wide, except for steam and oil such as media, also applies to contain granular solids and high viscosity medium, can also be applied to do the vent valve and valve to use of low vacuum system; 4. Gate Industrial Valves is a valve with double flow, the flow direction of medium is not subject to restrictions, so is suitable for the medium may change the flow direction of pipeline, and ease of installation. Six. Gate valve 1 performance shortcomings. High design appearance, size, closed time is long. The need when open the valve plate to the upper valve cavity, closing and need all the Industrial Valves plate to the seat, so the valve plate of lifting large travel, time is long; 2. Because the two gate valves in the valve plate and valve seat sealing surface friction exist in the process of opening and closing, so the sealing surface is easy to scratch on the sealing performance and service life have influence, and not easy to repair. Seven. The performance of different structure of gate valve is 1. Single wedge gate valve a and structure more flexible disc valve is simple; B, at high temperatures, sealed performance is not as good as elastic slide valve or double gate valve; C, suitable for medium of high temperature anti-coking. 2. Flexible disc gate valves, it is a special form of wedge type single ram valve. When compared with wedge gate valve, high temperature, good seal performance, ram heated not easily stuck; B, suitable for steam and hot oil and oil and gas medium, and is suitable for frequent switch parts; C, do not apply to easy coked medium. 3. Double gate valve a, sealed performance is good wedge gate valve, when the sealing surface of cooperate to be not very accurate Angle and seat, still has good sealing performance; B, after the disc sealing surface wear, spherical centers at the bottom of the metal pad can be used after the replacement, general need not surfacing welding and grinding seal face; C, suitable for steam and hot oil and oil and gas medium, and is suitable for frequent switch parts; D, do not apply to easy coked medium.
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