JIS 5K 10K Soft Sealed Rubber Lined Concentric Wafer Type Cast Iron Butterfly Valve

The "ears" of a wafer type butterfly valve are the protruding portions on either side of the valve body. These ears typically have holes or slots in them, allowing for the valve to be easily mounted between two flanges in a pipeline. They serve as attachment points for bolts or studs to secure the valve in place. These ears are a distinctive feature of wafer type butterfly valves and are crucial for their installation and operation in a pipeline system.

The seat design of a wafer butterfly valve is an essential element that ensures proper sealing and functionality of the valve. Typically, wafer butterfly valves have a resilient seat, which means that the seat is made of a material that can deform slightly to provide a tight seal when the valve is closed. This material is often elastomeric, such as EPDM (ethylene propylene diene monomer) or NBR (nitrile butadiene rubber).

The seat is located around the perimeter of the valve's disc, where it makes contact with the valve body when the valve is closed. When the valve is in the closed position, the resilient seat compresses against the valve body, forming a seal to prevent leakage. This design allows the valve to achieve bubble-tight shut-off.

Additionally, some wafer butterfly valves may have a replaceable seat design, where the seat can be easily replaced if it becomes worn or damaged, extending the valve's service life.

The standard for wafer type butterfly valves can vary depending on factors such as the intended application, industry requirements, and geographical location. However, some common standards that are often referenced or adhered to in the design, manufacturing, and testing of wafer type butterfly valves include:

API (American Petroleum Institute) Standard 609: This standard covers the design, materials, testing, inspection, and marking requirements for butterfly valves used in industries such as petroleum, chemical, and natural gas.

ISO (International Organization for Standardization) Standard 5752: This standard specifies the face-to-face dimensions of wafer type butterfly valves for use in pipelines.

MSS (Manufacturers Standardization Society) SP-67: This standard covers the requirements for resilient-seated butterfly valves, including wafer type, lug type, and flanged-end type valves.

EN (European Norm) 593: This standard specifies the design, dimensions, and testing requirements for butterfly valves, including wafer type, for general industrial applications.

ASME (American Society of Mechanical Engineers) B16.34: This standard covers valves, including butterfly valves, for use in pressure piping applications.

These standards provide guidelines for manufacturers to ensure the quality, performance, and interchangeability of wafer type butterfly valves in various industries and applications. It's essential for manufacturers and users to verify which specific standards apply to their region and requirements.

EPDM (ethylene propylene diene monomer) butterfly valves are widely used in various industries and applications due to their excellent properties and versatility. Some common applications of EPDM butterfly valves include:

Water and wastewater treatment: EPDM butterfly valves are suitable for controlling the flow of water and various chemicals in water and wastewater treatment plants. They are resistant to corrosion and chemical degradation, making them ideal for these harsh environments.

HVAC (Heating, Ventilation, and Air Conditioning) systems: EPDM butterfly valves are used in HVAC systems to regulate the flow of air, water, and other fluids. Their compatibility with a wide range of temperatures and resistance to moisture and UV exposure make them suitable for this application.

Food and beverage processing: EPDM butterfly valves are commonly used in the food and beverage industry for controlling the flow of ingredients, cleaning solutions, and other fluids. They meet FDA (Food and Drug Administration) regulations for food contact materials and are resistant to microbial growth.

Pharmaceutical industry: EPDM butterfly valves are used in pharmaceutical manufacturing facilities for controlling the flow of various liquids and gases. Their high purity, resistance to sterilization processes, and compliance with regulatory standards make them suitable for this critical application.

Chemical processing: EPDM butterfly valves are utilized in chemical processing plants for handling a wide range of corrosive and abrasive fluids. Their chemical resistance, durability, and ability to maintain a tight seal even in harsh conditions make them suitable for this demanding environment.

Agriculture: EPDM butterfly valves are used in agricultural irrigation systems for controlling the flow of water and fertilizers. Their resistance to weathering, UV exposure, and agricultural chemicals make them ideal for outdoor applications.

Overall, EPDM butterfly valves are valued for their versatility, durability, and resistance to a wide range of chemicals and environmental conditions, making them suitable for diverse industrial applications.