The commonly used automatic exhaust valves include models such as ZP-I, ZP-II, ZPT-C, P21T-4, PQ-RS, and ZP88-1. These valves are typically shown in Figure 1-27, which illustrates their structural design and installation methods. Below is a detailed description of each type:
1. **ZP-I, ZP-II, and ZPT-C Automatic Exhaust Valves**: These are standard automatic air vent valves designed for use in water piping systems. They are suitable for both hot and cold water applications, with different temperature and pressure ratings depending on the model.
2. **P21T-4 Vertical Automatic Exhaust Valve**: This model is specifically designed for vertical installation. It has a nominal diameter (DN) of 20 mm and is suitable for systems where the water temperature does not exceed 120°C and the operating pressure is less than or equal to 0.4 MPa.
3. **PQ-RS Type Automatic Exhaust Valve**: This valve is available in a smaller size, with a DN of 15 mm. It is ideal for low-pressure and moderate-temperature applications, where the water temperature remains below 110°C and the pressure is under 0.4 MPa.
4. **ZP88-1 Vertical Automatic Exhaust Valve**: This model is available in two sizes: DN15 and DN20. It is suitable for systems where the water temperature is below 110°C and the working pressure is up to 0.8 MPa. Its versatility makes it a popular choice in various plumbing and HVAC applications.
In terms of specifications, the ZP-I and ZP-II models are suitable for systems with temperatures up to 110°C and pressures up to 0.7 MPa. The ZP-II model can handle slightly higher temperatures, up to 130°C, and pressures up to 1.2 MPa. Each model is selected based on the specific requirements of the system to ensure optimal performance and longevity.
These valves play a crucial role in removing air from the system, preventing corrosion, and ensuring efficient fluid flow. Proper selection and installation are essential to maintain the reliability and efficiency of the entire piping network.
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