A Comprehensive Guide to Excess Flow Check Valves and its Features

Excess Flow valves also referred to as velocity check or seismic valves, are created to shut down immediately after a sudden surge of flow. An excess flow valve is basically an in-line valve via which liquid or pressurized gas flows in both the directions. They shut down after excessive discharge of vapor or liquid caused due to the breaking of the pipe system. After the flow rate has exceeded the setting of the valve, it continues to remain closed till the time system pressure becomes stable. In case the flow doesn’t exceed, the valve’s setting won’t close.

A leading number of excess flow check valve manufacturers are manufacturing innovative and affordable valves, which are available in different configurations, flow rates and sizes, based on the vessel’s construction and the desired flow rate that are crucial for completing the process. Read on to find out more about excess flow check valves and their unique features.

Excess flow check valves

The excess flow check valves can be easily purchased in numerous pressure materials, classes, end connections and flange designs. These valves undergo stringent check in a certified flow laboratory for performance and durability. The excess flow valve is basically a spring loaded check valve that closes only after flow of vapor or liquid via the valve produces sufficient force or flow for overcoming the strength of the spring that helps in keeping it open. Each of these valves is available in multiple sizes as well as flow rates based on the reason for which they’re being used. It is important to determine the purpose for which the valve will be used prior to installing it. The excess flow valves are utilized for different fluids as well as processes including excess flow check valve for lpg gas, anhydrous ammonia, butane, nitrogen air, anhydrous chlorine, water etc.

They allow vapor or liquid to flow in different directions. The flow is usually controlled in one specific direction as each of the valves come with an arrow. Hence, when the flow in the desired direction surpasses the already determined flow rate, the excess flow check valve closes automatically.

The disk of the valve remains in an open position with the help of a spring. After the vapor or liquid flow results in a drop in the pressure across the disc of the valve that is exceeding the present flow rate, the disk of the valve closes against the valve’s opening to hinder the flow of the liquid or vapor. This valve disk remains closed till the time the pressure between both the downstream and upstream sides of the flow check valve equalizes. After the pressure equalizes, the flow check valve will open automatically. As a result, when the line’s broken or ruptured, the pressure towards downstream won’t equalize and the valve won’t open till the time the line’s been repaired.

To sum up, excess flow check valves are ideal for handling fluid components for oil and gas, chemical as well as petrochemical industries as well as water blast organizations.

Guidelines for LPG Filling Stations Installation

LPG is and will continue to be a major source for cooking and its share in vehicle industry is also going up with time. To ensure convenience of the mass and easy availability of LPG, refilling stations have to be set up. It is necessary to buy parts from the right agency and hiring apt ones for setting up LPG filling stations is also necessary.

Prerequisite for setting up LPG Filling center

Setting up LPG filling stations involves installation of important parts and spares and a company well versed in this sector can handle such tasks. LPG being a highly inflammable substance, it becomes necessary to assess credibility and capability of available contenders and choose the one making highest quality product. Quite often, the companies manufacturing such specialized products also offer lpg tank installation for the buyers and clients.

Buying the right parts and components

The vane pump is among the most important parts used in setting up LPG filling centers, as it is. It is better to acquire quality rotary vane pumps with enhanced mechanical efficiency from reputed manufacturers. This ensures LPG filling and transfer can be handled without hassles and risk of leakage will be very low. It is also necessary to procure high quality parts like LPG gas vaporizer, safety relief valves and electric propane vaporizer to set up refilling stations.

How to choose the manufacturers

For LPG filling and transfers at the refilling stations, buying highest quality products is a need you simply cannot ignore. Using the following tips to assess the manufacturers will be useful:

• Tenure- First of all, you need to learn about tenure of the manufacturing company. A company with long tenure and experience in manufacturing products required for LPG handling is better than new ones.
• Clientele- The existing clientele and completed projects of the lpg filling stations installation company have to be analyzed with care. It is better to go for products and services of a company that has several coveted clients, including international ones.
• Safety protocols and certifications-The company manufacturing LPG filling and transfer components should adhere to industry standard safety protocols. It is always better to pick a company that is known for compliance to manufacturing safety standards and has credible certification in this regard. Some of the lpg bottling plant manufacturers and installers resort to cutting edge and patented technologies to manufacture specific parts and pumps for use in LPG stations.
• Product range- The existing product range of the company making Vane pump and other LPG transfer and filling products should be checked. It is better to pick a company with wide product range. Some companies may even make customized pumps to meet client requirements well.

A final assessment
Top notch lpg tank manufacturers have online presence and their websites offer in-depth information on product range and related aspects. However, the buyers may still do some additional assessment before placing order. Direct interaction with the companies through email, chat can be helpful and using social media a can be beneficial too.

How Does a Vane Pump Work?

Vane pumps have been in use for a long time now. Ever since LP gas and fuel oils came into existence, there was a need for a pump that would help handle these gases efficiently. While there are other pumps that have the ability to deal with gases, but when there are refrigerants, gasoline, ammonia, fuel oils and alcohol are involved, you will need a specialized pump that would help handle these moderate viscosity liquids. Depending on the amount of gas that will be dealt with, you can choose from the various number of vane configurations that are available. Starting from external vane to swinging vane to sliding vane and rolling vane, there is no shortage of the types of vane pump that are available and it is important that you keep an eye on the type of gas that will be used. There are two big reasons why vane pumps have become so popular; first, they have the capacity to handle fluids in extreme temperatures. The lowest temperature recorded is – 25 F and the highest has been 500 F. Vane pump manufacturers make sure that the pumps are made to reach their peak performance every time they are used.

How they work?

As mentioned above, vane pumps are found with various configurations, but the operating system is the same for all. Here is a detailed description of how the pump works:

• There are two things that help operate the pump smoothly; the cycloidal cam and slotted rotor. The rotor works in tandem with the cycloidal came because the latter provides total support to it. The rotor together with the cam will form a crescent shape and the blades are fit on the slots. When the pump is switched on, the rotor will start rotating. When this happens, the fluid will enter the pump and all the respect vanes will start working. However, the pump maintains a very good suction to help the fluid enter properly.
• Once the fluid starts to enter the pump, it has to reach the chamber. For this, the cam has enough holes that creates pockets by the rotor, vane, side plate and cam.
• Last, but not the least comes the step where the fluid reaches the discharge port. The rotor will rotate and the fluid will enter while the vane will sweep that liquid to the other side of the crescent. With the holes in the cam, the fluid will be squeezed and slowly the fluid will reach the exit port and the function of the pump will be completed.

A very big advantage of using vane pumps is that you can be rest assured that the fluid will be pumped carefully and very systematically. Another reason why vane pumps are becoming excessively popular is because of their ability to handle high pressure for the thinnest of liquids. If you are in search for such pumps, you should try searching online with vane pump manufacturers India. Choose from the type of pump your need according to the purpose it will serve.