PN10/PN16 Composite Exhaust Valve Parameter Comparison and Selection Guide  

PN10/PN16 Composite Exhaust Valve Parameter Comparison and Selection Guide

In the piping system, the composite exhaust valve is a crucial auxiliary component that ensures the stable operation of the water system. Its core function is to remove the accumulated air in the pipeline, preventing pressure fluctuations, equipment vibrations, and even damage caused by the accumulation of air. With the increase in pressure in industrial and civil pipe networks, the application of composite exhaust valves with pressure ratings of PN10 (1.0 MPa) and PN16 (1.6 MPa) has become increasingly widespread. This article will compare the parameter differences between the two and provide targeted selection suggestions to assist in efficient engineering selection.

Comparison of Core Parameters of PN10 and PN16 Composite Exhaust Valves

The performance parameters of the composite exhaust valve directly affect its adaptability in different working conditions. The main differences between PN10 and PN16 lie in the following aspects:

Pressure grade and applicable scenarios

PN10 indicates a nominal pressure of 1.0 MPa (approximately 10 kilograms force per square centimeter), which is suitable for medium and low-pressure pipeline systems and is commonly found in residential building heating, small industrial circulating water or agricultural irrigation scenarios; PN16 corresponds to 1.6 MPa (approximately 16 kilograms force per square centimeter), capable of handling high-pressure environments, such as direct water supply systems in high-rise buildings, high-pressure process pipelines in large factories or long-distance water transmission projects.

Structural Design and Pressure-bearing Capacity

The valve body and internal sealing components (such as stainless steel balls and plugs) of the PN16 composite exhaust valve are usually made of more pressure-resistant materials or have a thicker wall thickness design to withstand higher water pressure impacts. The float lever structure of this valve may optimize the sealing surface accuracy, reducing the risk of air leakage under high pressure; while the PN10 exhaust valve structure is relatively simplified, ensuring basic exhaust function while offering a more cost-effective solution.

Exhaust efficiency and response speed

Under high-pressure conditions (PN16), the air density inside the pipeline is higher. The large-sized intake and exhaust ports of the PN16 exhaust valve (compared to PN10) can accelerate the expulsion of trace amounts of air; at the same time, the sealing gap between the plug and the valve seat is smaller, and when negative pressure is generated inside the pipe (such as when the water pump stops), the PN16 exhaust valve can draw in air more quickly, providing a stronger ability to protect the pipeline from vacuum damage.

Material and Corrosion Resistance

Both are mainly made of stainless steel. However, the material grade of the PN16 exhaust valve may be higher (such as upgrading from 304 stainless steel to 316L) to cope with high pressure, high temperature or environments containing corrosive media (such as seawater desalination systems); the PN10 exhaust valve can meet the requirements in ordinary water quality environments and is more suitable for non-corrosive liquid transportation scenarios.

Scientific Selection Suggestions for PN10/PN16 Composite Exhaust Valves

When selecting, it is necessary to consider the actual operating conditions of the pipeline system and pay particular attention to the following factors:

Prioritize matching system pressure

If the nominal pressure of the pipeline is 1.0 MPa, a PN10 exhaust valve can be selected; if the system pressure remains above 1.6 MPa for a long time (such as in the top floor pipeline of a high-rise building), a PN16 valve should be chosen to avoid valve seal failure or structural deformation due to excessive pressure.

Select the pipe diameter based on the flow rate and pipe size

The exhaust volume is directly related to the pipe diameter. For large pipe diameters (such as DN100 and above), a large-diameter exhaust valve (such as DN100, DN150) must be selected to ensure that the air can be discharged quickly; for small pipe diameters (such as below DN50), the DN25-DN50 specifications can be chosen. Note: The larger the flow rate, the size of the inlet and outlet of the exhaust valve must be increased simultaneously; otherwise, problems such as "inadequate exhaust and frequent valve opening and closing" may occur.

Consider the characteristics of the medium and the environment

For ordinary water and cooling water, PN10 stainless steel exhaust valves can be selected; if the water is at high temperature (＞80℃) or contains particulate impurities, it is recommended to upgrade to PN16 and combine with a design to prevent blockage (such as adding a filter screen); in corrosive medium environments such as those in chemical industries or seawater, a combination of PN16 + 316L material should be chosen to extend the service life of the valve.

Installation location and maintenance requirements

The exhaust valve should be installed at the highest point of the pipeline (where air tends to accumulate). The PN16 exhaust valve, due to its more compact structure, can be adapted to narrower installation spaces. Additionally, in high-pressure scenarios, it is recommended to regularly check the wear of the sealing surface. The maintenance cycle of the PN16 exhaust valve can be appropriately shortened (e.g., once every six months) to ensure long-term stable operation.

Summary

The PN10 and PN16 composite exhaust valves each have their own advantages: The PN10 is suitable for medium and low pressure, as well as ordinary medium scenarios, with outstanding cost performance; while the PN16, with its higher pressure-bearing capacity and protective performance, becomes the preferred choice for high-pressure pipeline networks. When selecting, it is necessary to closely focus on the three core elements of system pressure, flow rate, and medium characteristics, and choose the appropriate specification based on specific working conditions, so as to maximize the efficiency of the exhaust valve and ensure the safe and efficient operation of the pipeline system.