Product Overview

The Check Valve PP is a flow control device designed to allow fluid to pass in one direction only while preventing backflow. It is specifically engineered for use with clean water environments and ensures unidirectional flow by using a spring-loaded or gravity-operated mechanism. This makes it ideal for applications where maintaining forward flow integrity is critical, such as in filtration systems, piping networks, and process lines requiring protection against reverse flow.

Construction and Materials

The valve body is constructed from polypropylene (PP), which provides excellent chemical resistance, high transparency, and suitability for clean environments. The main structural components are made from PP resin, ensuring durability and compatibility with non-corrosive fluids. Critical metal parts, such as the valve stem or support structure, are fabricated from SUS304 stainless steel, offering superior strength and corrosion resistance in chemical atmospheres. No copper-based metallic material is used in the flow path to avoid contamination in clean environments.

Configuration and Connections

The check valve features a threaded connection interface with standard metric thread sizes available in φ4, φ6, φ8, φ10, and φ12 mm (equivalent to φ5/32, φ1/4, φ5/16, φ3/8, and φ1/2 inches). These dimensions are designed for compatibility with common pipe fittings and standard plumbing systems. The valve is available in a clean-room package specification, ensuring minimal contamination during handling and storage.

Operating Characteristics

The check valve operates within an ambient temperature range of 0 to 80°C (no freezing), with a maximum operating pressure of 1.0 MPa at temperatures between 0 and 20°C. It can withstand a maximum vacuum of -100 kPa and has a minimum operating differential pressure of 5 kPa at 25°C. The valve opens when the differential pressure reaches a minimum of 0.01 MPa, ensuring reliable flow initiation under operational conditions.

Sizes and Options

Available in multiple sizes including φ4, φ6, φ8, φ10, and φ12 mm (φ5/32, φ1/4, φ5/16, φ3/8, φ1/2 inches), the check valve offers flexibility for various system requirements. All variants are supplied in a clean-room package with fluorine grease applied to ensure smooth operation and long-term reliability. The seal rubber material is either FKM or EPDM depending on application conditions; FKM is used when low ozone concentration is present, while EPDM provides superior weather and cold resistance (though it has limited resistance to mineral oils).

Installation and Integration

The check valve integrates directly into piping systems via its threaded connection points. Installation requires alignment with the flow direction and secure tightening of the mating threads to ensure a leak-free seal. The absence of copper-based materials in the flow path ensures compatibility with clean, non-corrosive fluids such as water, making it suitable for use in food, pharmaceutical, or medical-grade environments where material purity is essential.