Valve knowledge: selection skills of flanged gate valves
Flanged gate valve is a gate valve with flange connection,this connection method is the most common.Flanged gate valves are stable and reliable when used in pipelines, so flanged gate valves are often used in high-pressure pipelines.
The selection skills of flanged gate valves mainly have the following two points:
1. Structure and working principle of radiator flange gate valve
The temperature control in the user's room is realized by the radiator thermostatic control valve. The radiator thermostatic control valve is composed of a thermostatic controller, a flow regulating valve and a pair of connecting parts. The core component of the thermostatic controller is the sensor unit, that is, the temperature bulb. The temperature bulb can sense the change of the surrounding environment temperature to produce volume changes, drive the adjustment valve spool to produce displacement, and then adjust the water volume of the radiator to change the heat dissipation of the radiator. The set temperature of the flanged gate valve can be adjusted manually, and the flanged gate valve will automatically control and adjust the water volume of the radiator according to the set requirements, so as to achieve the purpose of controlling the indoor temperature. The flanged gate valve is generally installed in front of the radiator, and realizes the room temperature required by the residents by automatically adjusting the flow. Flanged gate valves are divided into two-way flanged gate valves and three-way flanged gate valves. The three-way flanged gate valve is mainly used in a single-pipe system with a spanning pipe, and its shunt coefficient can be changed within the range of 0-100%. There is a lot of room for flow adjustment, but the price is more expensive and the structure is more complicated. Some two-way flanged gate valves are used in double pipe systems, and some are used in single pipe systems. The two-way flanged gate valve used in the double-pipe system has higher resistance; the resistance used in the single-pipe system is lower. The temperature sensor of the flanged gate valve and the valve body are generally assembled as a whole, and the temperature sensor itself is the on-site indoor temperature sensor. If necessary, a remote temperature sensor can be used; the remote temperature sensor is placed in the room requiring temperature control, and the valve body is placed in a certain part of the heating system.
2. Selection design of flange gate valve
Flanged gate valve is the most important regulating device for flow regulation of heating system, and other regulating valves are auxiliary equipment, so flanged gate valve is necessary. A heating system cannot be called a heat metering and charging system without a temperature control valve. In the design of flanged gate valves, correct selection is very important. The purpose of flanged gate valve selection is to determine the KV value (flow coefficient) according to the design flow rate (under known thermal load) and allowable resistance drop; then the KV value determines the diameter (model) of the temperature control valve. Therefore, the relationship between KV value and diameter must be given in the design atlas or manufacturer's sample, otherwise it is not convenient for designers to use.
In the selection and design of flanged gate valves, it is by no means a simple selection of flanged gate valves with the same diameter as the pipeline. But in the selection process, create an ideal pressure difference working condition for the selected flanged gate valve. The normal working pressure difference of a flanged gate valve is between 2to3mH2O, and the maximum does not exceed 6to10mH2O. For this reason, the preset value range of the flanged gate valve must be given to prevent noise from affecting the normal operation of the flanged gate valve.When under the same KV value,there are more than two choices of caliber, the flanged gate valve with a smaller caliber should be selected first, the purpose is to improve the regulating performance of the flanged gate valve.
Hebei Huahui Valve Co.,Ltd (Botou Yaxing Fluid Equipment Co.,ltd) specialize in designing and manufacturing various kinds of high quality valves,such as: Gate valve,Butterfly valve,Check valve,Strainer,Hudraulic control valve(float valve,pressure reducing valve,pressure relief valve, flow control valve) ,HVAC balancing valve,Air release valve,Rubber flexible joint and Stainless steel flexible joint,Pipe fittings(unicersal coupling, flange adaptor, repair clamp, saddle...),Flange gate valve etc.Welcome old and new customers visit our factory and develop business with us.