Publish Time: 2021-06-09 Origin: Site
Liquefied petroleum gas is a colorless volatile liquid obtained by liquefying natural gas or petroleum under pressure and cooling. It is very easy to ignite spontaneously. When its content in the air reaches a certain concentration range, it can explode when it encounters an open flame. Nowadays, the scope of use of liquefied petroleum gas is becoming wider and wider, the amount of use is increasing, and the development is faster and faster. Therefore, it is very necessary and urgent to strengthen the publicity and learning of LPG knowledge and ensure the safe use of LPG.
Here is the contest list:
• What is a liquefied petroleum gas valve?
• How should the liquefied petroleum gas valve operate?
• Installation and use of liquefied petroleum gas valve
The liquefied gas valve, also called the cut-off door, is the most widely used valve. The reason why it is popular is that the friction between the sealing surfaces is small during the opening and closing process, it is relatively durable, the opening height is not large, and it is easy to manufacture. The maintenance is convenient, not only suitable for medium and low pressure, but also suitable for high pressure. Its closing principle is to rely on the pressure of the valve stem to make the sealing surface of the valve clack closely fit the sealing surface of the valve seat to prevent the medium from flowing.
The liquefied gas valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface to not leak. When the medium enters the valve cavity from below the valve disc, the resistance that the operating force needs to overcome is the friction force of the valve stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve The diameter of the stem should be large, otherwise the valve stem will bend up failure. In recent years, since the emergence of self-sealing valves, the medium flow direction of the shut-off valve has changed from above the valve clack into the valve cavity. At this time, under the action of the medium pressure, the force of closing the valve is small, while the force of opening the valve is large. The diameter can be reduced accordingly. At the same time, under the action of the medium, this type of valve is also tighter.
The liquefied gas valve only allows the medium to flow in one direction and is directional when installed. Its structural length is longer than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.
When the liquefied gas valve is opened, when the opening height of the valve flap is 25% to 30% of the nominal diameter, the flow has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the shut-off valve should be determined by the stroke of the valve disc.
The main function of liquefied petroleum gas is to adjust the air pressure of various parts of the liquefied petroleum gas, so as to ensure that the liquefied petroleum gas can work normally. When installing it, follow the correct installation method to ensure its normal use and will not threaten the safety of users.
In Ningbo Fuhua Valve Co.,Ltd., you can find a series of LPG gas valves. Ningbo Fuhua Valve Co., Ltd. has a unique position to use standardized valves to serve the industry, and can meet commercial, agricultural and household applications in a wide range of market areas that require the use of gas cylinder valves.