The GL41 forged steel strainer is a cryogenic filter specifically designed for operating conditions with media temperatures ranging from -196℃ to -29℃. It is utilized for the timely removal of solid impurities, preventing accumulation within the system that could lead to scale formation or blockage of equipment and pipelines. For environments below -100℃, particularly when austenitic stainless steel is employed, key components such as the body, cover, and filter mesh undergo a specialized cryogenic treatment (deep cooling) prior to finishing. This process involves immersion in liquid nitrogen to reach a stable temperature of -196℃, maintaining this state for two to six hours before allowing the components to return to room temperature naturally.

Depending on the operating temperature, the pipeline strainer’s gaskets can utilize flexible graphite, PTFE, or multi-layer combinations of lip seal rings, ensuring excellent performance at low temperatures. As an essential filtration device for media-conveying pipeline systems, the GL41 forged steel strainer is typically installed at the inlet of pressure reducing valves, relief valves, constant water level valves, or other critical equipment to remove impurities and protect the normal operation of valves and machinery. The GL41 forged steel strainer features a robust structural design, low flow resistance, and convenient blowdown capabilities. Generally, the filter mesh specifications are 18-30 mesh for water service, 10-100 mesh for gas service, and 100-480 mesh for oil service.

Product Image of GL41 Forged Steel Strainer

1.Superior mechanical properties and high-pressure resistance:Produced through high-temperature forging of premium steel, the dense metallic structure eliminates common casting defects such as blowholes and pores. It possesses exceptional pressure-bearing capacity and impact resistance, ensuring the safety of pipeline operation under high pressure, high temperature, and complex alternating load conditions.
2.Streamlined structure and low flow resistance design:The internal cavity features a scientifically designed Y-pattern streamlined flow path with a rational cross-sectional distribution, effectively reducing pressure drop as the medium passes through. The built-in precision stainless steel filter screen provides a large effective filtration area, ensuring efficient interception of mechanical impurities while maintaining maximum flow performance of the network.
3.Highly reliable and tight sealing structure:The connection between the cover and body adopts high-precision threaded sealing or metal gasket structures, processed by precision machine tools to effectively prevent medium leakage. Especially in environments with frequent high-temperature and high-pressure fluctuations, it maintains excellent sealing stability, making it suitable for rigorous media such as flammable, explosive, or high-pressure gases.
4.Simple maintenance and rapid online operation:Utilizing a compact design, the lower end is equipped with a removable blowdown plug or cover. When cleaning the screen is required, simply remove the fasteners to quickly extract the filter element for cleaning or replacement without dismantling the entire valve body from the pipeline, significantly shortening maintenance downtime.
5.Broad adaptability to working conditions:Due to the excellent temperature stability and mechanical strength of forged steel, this strainer is widely used in petroleum, chemical, natural gas, power systems, thermal oil, and steam pipeline networks. As an ideal pre-protection device for downstream pumps, compressors, instruments, and precision equipment, it offers an extremely long service life.

Structural Drawing of GL41 Forged Steel Strainer

List of Component Names and Materials

Performance Specification Sheet

Standard requirements for external dimensions

1、Design and Manufacture: In accordance with MFG standards.

2、Testing and Inspection: In accordance with API 598.

3、Face-to-Face Dimensions: In accordance with MFG standards.

4、Flange Dimensions: In accordance with ANSI B16.5 technical requirements.

Outline Drawing of GL41 Forged Steel Strainer

Outline dimension table