The Compressed Air Precision Filter series HF1-12-8-DPL and HF7-32-8-DPL are high-performance filtration solutions engineered for compressed air systems requiring reliable removal of contaminants including oil, moisture, and solid particulates. These filters are designed as direct replacements for HF Series compressed air filters, delivering the same quality and performance at a competitive factory-direct price.
Both filters feature corrosion-resistant stainless steel internal and external cores, advanced media technology, and reliable DPL automatic drain mechanisms. The pleated filter element design maximizes surface area, ensuring lower pressure drops and extended service life compared to standard elements.
| HF7-32-8-DPL | HF1-12-8-DPL | |
|---|---|---|
| Filter Grade | Grade 7 – General Purpose Air Line Filter | Grade 1 – Oil Vapor Removal Filter |
| Filtration Accuracy | 1 μm | 0.01 μm |
| Maximum Residual Oil Content | 1.0 ppm | 0.003 ppm |
| Filter Media | Multi-layer epoxy-bonded blended fiber | Activated carbon |
| Core Material | Corrosion-resistant stainless steel | Corrosion-resistant stainless steel |
| Connection Size | 2″ NPT | 3/4″ NPT |
| Maximum Operating Pressure | 300 psi | 300 psi |
| Maximum Operating Temperature | 66°C | 66°C |
The HF7-32-8-DPL and HF1-12-8-DPL compressed air precision filters are widely used across industries requiring clean, dry compressed air:
Xinxiang City Huahang Filter Co., Ltd. is a professional industrial filter manufacturer integrating design, production, and marketing. With over 20 years of specialized experience in the filtration industry, Huahang has established itself as a premier manufacturer and supplier in the global filtration market. The company is headquartered in Henan, China, and operates state-of-the-art, automated production facilities equipped with precision manufacturing and quality control systems.
The company specializes in manufacturing alternative filter elements that meet or exceed OEM specifications, providing customers with high-performance, cost-effective filtration solutions.
Q1: What is the difference between a precision filter and a standard compressed air filter?
A: A standard compressed air filter is generally used for basic particulate or water separation.
A precision filter provides higher filtration efficiency and tighter control of fine particles and oil aerosols, making it more suitable for applications such as precision pneumatic equipment, electronics, pharmaceuticals, painting and other processes requiring cleaner compressed air.
Q2: How does a precision coalescing filter work?
A: The compressed air passes through a fine fiber filtration medium.
Small oil and water aerosols are captured by the fibers and combine into larger droplets. The larger droplets move toward the drainage layer and flow down into the filter bowl, where they can be removed through an automatic or manual drain.
The basic process is:
Capture → Coalescence → Drainage
An anti-re-entrainment layer can also help prevent separated liquid from being carried back into the compressed-air stream.
Q3: Why is low pressure drop important for compressed air filters?
A: Compressed air is energy-intensive, so unnecessary pressure loss can increase compressor operating costs.
A properly designed precision filter should provide a good balance between filtration efficiency, flow capacity and pressure drop. Larger effective filter areas and optimized flow paths can help reduce resistance.
Q4: Does a precision filter need a pre-filter?
A: For high-efficiency coalescing filters, using a suitable pre-filter can be beneficial.
The pre-filter removes larger particles and protects the finer coalescing element from premature contamination. This can help extend the service life of the precision filter and control pressure-drop increase.
