The control over liquid levels is one of the key considerations when it comes to safety and overall function of facilities in the processing industries that includes gas and oil, food, chemical industries as well. The installation of a float valve is commonly done to regulate the liquid level or flow within a tank.
Contact us to discuss your requirements of cooling tower float assembly. Our experienced sales team can help you identify the options that best suit your needs.
Float valves are also referred to as ball-cock valves. Since the use of float valves is employed in a varied range of applications and industries, the float valves are absolutely mechanical in their operations.
But when it comes to the selection of float valves, consumers can deal with overwhelming feelings because of the array of brands and types available in the market. In this guide, we help out to pick the most suitable float valves for your application by enumerating the key things that you need to know about this device.
Keep reading till the end to learn all about float valves.
The Primary Purpose of a Float Valve
The main purpose of the float valve is to regulate the fluid flow, fill the level of the tanks and cease overfilling or overflow while the valve connector attaches the valve to the incoming liquid. When the float rises and reaches to the determined level, the valve is then opened or shut down by the lever connected to the float.
All the components comprising the valve, connector and float work simultaneously to ensure that the liquid remains at the perfectly set level with the requirement for minimal monitoring by the technicians.
Types of Float Valves Available
There are mainly two types of available and they are -
Direct Float Control Valve
In this type of float valve, the float rises with the rise of liquid level in the tank. Here, the main valve opens or shuts by the movement of the float valve arm unit.
Designed with an assembly of controller, measurement device and a final control device all built in a single unit. The measurement is itself the ball-float.
Pilot Operated Float Control Valve
In this type of valve, when the liquid level in the tank increases, the float raises to shut the pilot valve. The developed liquid on the upper chamber of the primary control valve.
The upper chamber includes a diaphragm that exerts pressure over the primary valve to shut. The float settles down as with the liquid level and enables for liquid to pass through the float valve’s pilot line. Now, the main valve functions to open that allows the liquid to fill in the tank.
Selecting a Float Valve
The selection of a float valve must be done depending upon the following process limitations -
So, what are you waiting for? Now that you have a basic guide to refer to, make sure to choose the ideal float valve for your application now.
Float valves are mechanisms or machines used for filling tanks, reservoirs, or other containers for liquids. Also referred to as a ballcock, as the hollow float is often shaped like a ball, it’s essentially the same mechanism as one would find in flushing toilets, and helps prevent overflow or backflow. Consisting of a valve connected by a lever to a hollow and sealed float, they are mounted close to the top of the tank. The valve connects to the pipe bringing in the liquid, opening and closing as the lever raises or lowers the float. Once it reaches a certain level, the mechanism causes the lever to close the valve, cutting off the flow. Selecting a stainless steel float valve requires consideration of several factors, such as style and material. Keep reading to learn how to choose the best float valve for your application!
A float valve serves a simple purpose. It controls the flow of liquid from a source supply, such as a tank, and rising as the level of liquid in the tank rises. Float valves consist of three parts: the float device, float valve, and stem.
The valve connects to the float device through the stem, which acts as a lever to control the flow of liquid when the valve opens or closes. Generally, float valves are used in reserve tanks to keep liquid from flowing through piping, creating a leak-free seal when the stem rises. As the stem rises, the valve seals off the flow.
Want more information on fill in cooling tower? Feel free to contact us.
The float device normally contains air to give it buoyancy and is airtight. When liquid leaves the tank, the float device sinks with the liquid while the valve remains open until the floating device is again raised to a certain level, allowing liquid to refill the tank. Float valves prevent overflow or overfilling of tanks, diverting the liquid instead of draining it away. The valve and float move with each other as the tank empties and refills and can operate mechanically or hydraulically.
As a simple mechanical device controlling the level of liquids in tanks or reservoirs, float valves serve many purposes. Often used in domestic water systems, one application includes use in cold water header tanks to regulate pressure in hot water heaters. Smaller float valves fit into many toilets as well to regulate water flow. Depending on the application, valves work under high-pressure or low-pressure conditions. Below are a few of the many types of float valves used.
High-pressure float valves work in single-evaporator flooded systems. These are essentially containers used for storing liquid refrigerant, with float valves fitted to direct drained liquid from the condenser to the evaporator. It acts as a steam trap, working with refrigerants like ammonia or carbon dioxide.
Used for heaters, heat exchangers, boilers, and other high-temperature applications, these maintain the level of liquids at a precise level with the float triggering the valve’s opening or closing.
Sometimes called equilibrium float valves, these valves help resolve high operating torque. It consists of a single valve and a balance piston. The balance piston’s seal introduces a bit of friction, even with the reduction of operating torque, but as this can decrease modulation produced by waves it can offer significant benefit.
Used for filling over overflow control, these types of valves can reach 12 meters (approximately 40 feet) in diameter. These valves are most often used in reservoirs, operating either mechanically or via hydraulically actuated small pilot float valves.
Used to control the water level in steam condensers, depending on the water level this valve will either supply or dump water. The valve’s body is bolted to the condenser wall, with all parts of the mechanism subjected to the condenser’s vacuum and the combination consisting of two piston valves on different systems.
Also known as non-return valves, these are used in oil and gas fields to prevent unwanted fluids from flowing up the drill string. These valves halt the flow while others on the crew make or break connections.
Stainless steel offers numerous advantages over other materials. A stainless steel float valve will keep liquid levels constant through the use of their floats. Because of their corrosion resistance, they can be used not only for fresh water but also for seawater, corrosive liquids, harsh chemicals, and other special fluids.
Some benefits of using stainless steel float valves include:
Stainless steel float valves are often used to maintain water levels in industrial-grade tanks and water treatment plants. Float valves typically use T303 or T316 stainless steel alloys, with the former offering better machining properties and the latter offering better corrosion resistance.
Float valves can be made from a variety of different materials. As they are exposed to environments with different levels of corrosive substances, temperatures, and pressures, durability is a major issue. Stainless steel offers a variety of properties that make it a better option than other materials.
Materials vary and may be combined, depending on the manufacturer and application. Floats can be constructed from stainless steel, copper, plastic, or other materials, while the bodies often are constructed from stainless steel, bronze, or cast iron. Sometimes floats that are used in vertical rod systems employ counterweights to keep them submerged and provide better performance.
Using plastic reduces manufacturing costs, though most higher quality products will use stainless steel float valves rather than plastic, as they last longer and are generally more durable.
Both cast iron and stainless steel work well in high temperature and high-pressure environments, and cast iron’s low carbon content makes it more corrosion resistant than other ferrous metal alloys. The main advantage stainless steel has over cast iron is its chromium content of at least 10.5%, which reacts to oxygen to create a protective layer against corrosion.
Stainless steel offers much better protection against corrosion than brass, an alloy made from zinc and copper, and holds up better in environments high in chlorine. Stainless steel is especially resistant to corrosion from seawater and other harsh fluids, along with having a better pressure rating than brass. Brass conducts heat better and, as a softer metal than stainless steel, it also shapes more easily. Given brass alloys that include lead have been largely banned for plumbing applications, stainless steel is often a less expensive option as well.
Made mostly of copper combined with varying amounts of tin, bronze looks similar to brass, though it has certain unique benefits. It resists cracking and corrosion better but is less expensive than brass. Commonly used in the petrochemical industry, like stainless steel it also holds up well in marine environments and in high-performance applications.
Along with their use in toilets, stainless steel float valves are used in many industries for a variety of applications.
Applications for which stainless steel float valves can be used include:
As float valves operate mechanically, without the need for power, they are capable of working in remote locations. Their versatility makes them valuable for many industrial and other applications, with stainless steel float valves used in some of the harshest environments.
Arthur Harris offers more than 100 years of experience, with the capability to manufacture our floats in a variety of shapes, sizes, gauges, metals, and connections. To learn more about our stainless steel float valve selection, view our products here!
Are you interested in learning more about cooling tower factory? Contact us today to secure an expert consultation!