The common automatic exhaust valves are ZP-I, 1I, ZPT-C, P21T-4, PQ-RS, and ZP88-1. Their construction is shown in Figure 1-27. ZP-I, II, ZPT-C automatic exhaust valve.
1, ZP-I, II, ZPT-C automatic exhaust valve;
2, P21T-4 vertical automatic exhaust valve;
3, PQ-RS type automatic exhaust valve;
4, ZP88-1 vertical automatic exhaust valve.
The takeover specification is DN20 (DNl5, DN25). Type I is for pipes with hot and cold water temperatures less than or equal to 110 degrees Celsius and pressures less than or equal to 0.7 MPa. Type II is applicable for hot and cold water temperatures less than or equal to 130 degrees Celsius and pressures less than Equal to or equal to 1.2MPa pipeline; P21T-4 automatic exhaust valve to take over the specification for DN20, suitable for cold and hot water temperature is less than or equal to 120 °C, working pressure is less than or equal to 0.4MPa, the pipeline; PQ-RS automatic Exhaust valve to take over the specification for DNl5, suitable for cold and hot water temperature is less than or equal to 110 °C, pressure is less than or equal to 0.4MPa pipeline; ZP88-1 automatic exhaust valve to take over the specifications are DNl5 and DN20 two, suitable for cold Hot water temperature is less than or equal to 110 °C, pressure is less than or equal to 0.8MPa pipeline.
1, ZP-I, II, ZPT-C automatic exhaust valve;
2, P21T-4 vertical automatic exhaust valve;
3, PQ-RS type automatic exhaust valve;
4, ZP88-1 vertical automatic exhaust valve.
The takeover specification is DN20 (DNl5, DN25). Type I is for pipes with hot and cold water temperatures less than or equal to 110 degrees Celsius and pressures less than or equal to 0.7 MPa. Type II is applicable for hot and cold water temperatures less than or equal to 130 degrees Celsius and pressures less than Equal to or equal to 1.2MPa pipeline; P21T-4 automatic exhaust valve to take over the specification for DN20, suitable for cold and hot water temperature is less than or equal to 120 °C, working pressure is less than or equal to 0.4MPa, the pipeline; PQ-RS automatic Exhaust valve to take over the specification for DNl5, suitable for cold and hot water temperature is less than or equal to 110 °C, pressure is less than or equal to 0.4MPa pipeline; ZP88-1 automatic exhaust valve to take over the specifications are DNl5 and DN20 two, suitable for cold Hot water temperature is less than or equal to 110 °C, pressure is less than or equal to 0.8MPa pipeline.
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