Bottom drain valves Manufacturers online

Bottom drain valves or tank bottom valves are special valves that are installed in tanks or containers to drain liquids or media in a safe and controlled manner.

They are often used in the chemical industry, food and beverage production and in various industrial processes where tanks or containers need to be emptied or cleaned regularly. These valves are particularly useful as they allow the complete drainage of liquids, often without leaving any residue in the container.

Below is an overview of the operation, types and use of bottom drain valves:

How bottom drain valves work:

The way bottom drain valves work differs depending on the design. Basically, they are installed at the lowest point of a container and allow the contents to be drained without the risk of residue remaining. There are various mechanisms that control the drainage:

• Slide or piston mechanism: A movable slide or piston closes the drain. When the valve is opened, the slide is lifted or moved, allowing the liquid to escape. This mechanism is robust and ensures a secure seal when closed.
• Ball valve mechanism: Here, a pierced ball inside the valve is rotated to release or block the flow. When the hole in the ball is aligned with the pipe, the medium flows out. The valve is closed by turning the ball through 90 degrees.
• Diaphragm mechanism: Some bottom outlet valves use a flexible diaphragm that opens when pressure is applied to the valve. This type of valve is often used in hygienically sensitive areas as they are easy to clean and offer a high level of tightness.
• Needle valve mechanism: A needle moves into the valve seat and closes it when the valve is closed. This type of valve offers precise control of the flow, but is less common in bottom outlet valves.

Types of bottom drain valves:

Manual Bottom Drain Valves: These valves are manually operated by turning a lever or wheel to control the flow. They are simple in design and require no additional energy input, but are less suitable for automated systems.

• Automated bottom drain valves: Automated valves are controlled by electric, pneumatic or hydraulic actuators. These valves are ideal for applications where the draining process needs to take place regularly and without manual intervention. They enable precise control of the draining process and can be integrated into automated process control systems.
• Hygienic bottom drain valves: Especially for industries with strict hygiene requirements, such as the food or pharmaceutical industry, these valves are designed to be easy to clean and leave no media residue. They are usually made of stainless steel and comply with FDA or EHEDG regulations.
• Emergency drain valves: These valves are designed for use in situations where a container needs to be emptied quickly and completely, for example in the event of overpressure or a chemical incident. They can be equipped with safety mechanisms that allow for quick opening in an emergency.

Use of bottom drain valves:

Bottom drain valves have a variety of applications to suit the needs of industry and production. Some of the most important applications are:

1. Industry and chemical plants:
Bottom drain valves are used in chemical processes where tanks need to be emptied regularly. They enable aggressive chemicals or process fluids to be drained safely. Stainless steel or PTFE (Teflon) are often used as materials to resist corrosion.

2. Food and beverage industry:
In food processing, hygienic bottom drain valves are required to efficiently drain liquids such as beverages, dairy products or liquid ingredients. These valves are often made of stainless steel and comply with strict hygiene regulations. They are designed to prevent the build-up of residues that could contaminate the product.

3. Pharmaceutical industry:
In the pharmaceutical industry, bottom drain valves must meet strict cleanliness and tightness requirements to prevent product contamination. Valves with easy-to-clean mechanisms such as diaphragm valves are widely used here.

4. Waste water and sewage treatment plants:
Bottom drain valves are used in tanks or containers to safely drain sludge, wastewater or other liquids. In these applications, they are often more robust and designed to handle abrasive or solid particles.

5. Storage and process vessels:
In many industrial applications where liquids are stored or processed, bottom drain valves are necessary at the base of the tank to facilitate draining and cleaning.

Bottom drain valves are important components in tanks and vessels that allow liquids to be drained safely and efficiently. They are used in a wide range of industries, from the chemical and food industries to wastewater treatment. When selecting a bottom outlet valve, factors such as material, tightness, size, actuation type and ease of cleaning are crucial to ensure safe and reliable operation. Automated systems offer more precise control, while manual valves are a simple and cost-effective solution.

Here is an overview of the most important criteria to look for when purchasing bottom drain valves:

When purchasing bottom drain valves, there are several important aspects that should be carefully considered to ensure that the valve meets the requirements of the specific application.

• The type of medium that will pass through the bottom outlet valve is one of the deciding factors in the selection process. It is important to ensure that the valve and sealing materials are compatible with the medium to avoid corrosion and premature wear.
• For aggressive chemical substances, valves made of stainless steel or with a PTFE coating are ideal.
• In the food industry, hygienic requirements are crucial. Valves made of stainless steel (e.g. 1.4404) that meet EHEDG or FDA requirements should be used here.
• For waste water and contaminated media, valves made of robust, corrosion-resistant materials such as stainless steel or coated cast iron are required.
• The material plays a decisive role in the longevity and safe operation of the valve. The selection of the right material depends on the ambient conditions as well as the medium that is to pass through the valve.
• Stainless steel: Highly corrosion-resistant, ideal for aggressive chemicals, high temperatures and hygienic applications in the food, beverage and pharmaceutical industries.
• Cast iron: Robust choice for large tanks, especially for less aggressive media and higher pressures.
• Plastics: Suitable for less aggressive media and lower pressure requirements, e.g. in water treatment or the waste water industry.
• PTFE (Teflon): Highly resistant to chemicals and well suited for aggressive media, but less mechanically resilient.
• The choice of the right sealing material is decisive for the tightness and resistance of the valve to the respective medium.
• EPDM: Suitable for water, steam and some chemicals, but not resistant to oil and solvents.
• FKM (Viton): Resistant to many chemicals, oils and high temperatures.
• PTFE: Extremely resistant to chemicals, suitable for aggressive media and high temperatures, often used in the chemical and pharmaceutical industries.
• NBR: Suitable for oil and fuel applications, but not for high temperatures and aggressive chemicals.
• The size of the bottom drain valves must match the size of the tank and the flow rate. The common sizes are specified in DN (nominal diameter).
• Small nominal widths (DN 15 - DN 50): For applications with low flow rates or small containers.
• Large nominal diameters (DN 100 and larger): For large containers with high flow requirements, such as in chemical and industrial production.
• Manual bottom drain valves: Cost-effective and easy to handle. They are suitable for applications where the draining process takes place less frequently or where automation is not required.
• Automated bottom drain valves: These valves are equipped with electric, pneumatic or hydraulic actuators and are ideal for systems that require regular and precise opening and closing. Although they are more expensive, they allow easy integration into automated processes and offer greater process reliability.
• The valve must be suitable for the operating conditions in terms of pressure and temperature.
• The nominal pressure indicates how much pressure the valve can withstand. Common pressure classes are PN 16, PN 25 and PN 40.
• The valve must be able to withstand the operating temperature. Materials such as stainless steel or PTFE are suitable for high-temperature applications, while plastic valves are more suitable for lower temperatures.
• In the food, beverage and pharmaceutical industries, ease of cleaning is an important factor. Hygienic valves have smooth surfaces without dead spaces where residues could accumulate. Valves with CIP/SIP cleanability (Clean-In-Place / Sterilize-In-Place) are particularly suitable for these industries as they can be cleaned without disassembly.
• The connection type of the valve must match the pipe or tank. Common connection types are:
• Threaded connections: For smaller systems that require easy assembly and disassembly.
• Flanged connections: For larger tanks and industrial applications that require high tightness and stability.
• Welded connections: Provide a permanent connection, ideal for high pressure applications or where a permanent and tight connection is required.
• In some applications, especially in the chemical or oil industry, safety devices such as emergency drain systems are important to be able to react quickly in the event of an emergency. These valves can be equipped with special mechanisms that prevent accidental opening or open automatically in the event of overpressure.
• DIN, ISO and EN standards guarantee that the valve meets certain technical requirements.
• Special hygiene certifications such as FDA and EHEDG approvals are required for the food and pharmaceutical industries.
• For potentially explosive environments, an ATEX-certified version of the valve is required.
• A valve that is easy to maintain reduces downtime and maintenance costs. Depending on the design, it should be checked how easy it is to clean and repair the valve or replace seals. Valves where parts can be replaced without dismantling the entire system offer clear advantages.
• The purchase costs vary depending on the material, size and design. It is worth investing in high-quality valves to maximize service life and minimize long-term maintenance costs.
• Automated valves may incur higher initial costs, but offer long-term savings through reduced maintenance and increased process reliability.

By paying careful attention to these factors, you can ensure that the bottom outlet valve meets the requirements of your plant and provides a reliable and long-lasting solution.

Bottom drain valves can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Bottom drain valves from all over the world can be found on Exportpages.