Gate valves are more versatile in the pipeline, 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. Gate valves according to the internal structure of the different can be divided into: single wedge 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. Gate of the main 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 Industrial Valves, opening and closing also relatively effortless globe valve. 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 valve 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. Gate valve performance of main faults are: 1. 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 valve 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. Several different structure of gate valve performance comparison: ( 1) Wedge a single gate valves. Simple structure more flexible disc valve b. At higher temperatures, sealed performance is not as good as elastic slide valve or double gate valve. c。 Suitable for easy coking of high temperature medium. ( 2) A flexible disc valves. It is a special form wedge type single ram valve. When compared with wedge gate valve, high temperature, good seal performance, ram heated not easily stuck; b。 Applicable to steam, high temperature oil and oil and gas medium, and is suitable for frequent switch parts. c。 Does not apply to easy coking medium. ( 3) A double gate valves. 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 disc sealing surface wear, the spherical centers at the bottom of the metal pad can be used after the replacement, generally don't have to be surfacing welding and grinding seal face, this is the single disc and flexible disc does not have advantages. c。 Applicable to steam, high temperature oil and oil and gas medium, and is suitable for frequent switch parts. d。 Does not apply to easy coking medium. ( 4) A parallel type gate valve. Sealing performance poor than other forms of gate valves. b。 Suitable for low temperature and pressure of medium. c。 Gate and seat sealing surface processing and maintenance easier than other forms of gate valves. Difference: the rising stem gate and non-rising stem gate valve gate valve by valve lever lifting transmission gate opening and closing of the up and down, rising stem gate valves of transmission screw thread on the top of the stem stents, so by the position of the valve stem determine the open-close position of the ram, and the transmission thread also facilitate daily lubrication maintenance, at the same time from the fluid corrosion, the disadvantage is that the requirement of installation space is larger. Non-rising stem gate drive screw thread from inside the body, saved the space of the valve rod support, so the whole valve height decreases. To clear the open-close position, it can be installed above the valve cover opening and closing scale, applicable to the sewer (under Such as underground non-rising stem gate valves) , pipeline and other places in the narrow space, or dust content in place. Gate valves can also be based on different material, different pressure and different seal and connection mode, can be divided into different gate types.
Whenever the question of wedge valve resilient seated valve is raised, one comes across the term ''.
is a os & y valve fire protection flanged gate valve provided by Shenzhen Mech Valve Trading Co., Ltd. which is a leading manufacturer in China. For more information, visit Mech Valve.
With so many suggestions and tips on diferent solutions to os&y valve issues, it is truly important to know how to find the most appropriate gate valve at economical price.
Shenzhen Mech Valve Trading Co., Ltd. will need to find one that fits our needs and budgets, and still turns out a quality product.