Six key aspects inspected by the temperature control valve

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A temperature control valve consists of a control valve and a temperature controller. They are classified into heating type and cooling type according to their purpose. A self-acting temperature control valve consists mainly of a control valve and a temperature controller; it is an energy-saving device that operates automatically based on changes in the temperature of the medium being controlled, without the need for any external power source. Suitable for non-corrosive liquids, gases, and vapors, for temperature control in various cooling systems. When the temperature of the medium under control rises, the control valve closes (heating type) ； When the temperature of the medium under control rises, the control valve opens (cooling type). 　　The biggest advantage of temperature control valves is that they require only a standard 220V power supply; by utilizing the energy of the medium being regulated, they can automatically adjust and control the temperature of substances such as steam, hot water, hot oil, and gases. They can also be used to prevent overheating or in heat exchange applications. These valves feature a simple structure and are easy to operate. They offer a wide range of temperature adjustment options, fast response times, reliable sealing performance, and allow for adjustments during operation. As a result, they are widely used in industries such as chemicals, petroleum, food processing, textiles, as well as in hotels and restaurants for hot water supply. Six key aspects checked by the temperature control valve: 1. Detection of leaks at the sealed connections between components. The main connection points are ①. Sealing between the two water inlet connectors and the main body ； ②. The seal between a water outlet connector and the main body ； ③. Seal between the regulator housing and the main body ； ④. Seal between the regulator housing and the adjustment rod ； ⑤. Sealing between the flow switch component and the main body, etc. 2. Inspection to determine whether any required components are missing, installed incorrectly, or in the wrong orientation. This specifically refers to checking whether the various \"O\"-type seals are present; whether the ceramic moving and stationary elements are installed in the wrong direction (clockwise or counterclockwise); and whether the flow control switch, which should be in the closed position, is actually installed in the open position. 3. Testing of the control capability for high-pressure cold water: Fix the temperature-controlled mixing valve to the testing equipment, set the knob for adjusting the output temperature of the mixed water to “38°C”, turn on the flow switch of the temperature-controlled mixing valve. Once the output temperature of the mixed water stabilizes at 38°C, shut off the hot water supply, adjust the temperature control knob to a value higher than 38°C, and then turn on the flow switch. At this point, no cold water should flow out of the mixed water output port of the temperature-controlled mixing valve. Then, turn the temperature setting knob clockwise to the position that enables full cold water output; at this stage, a large amount of cold water should flow out of the mixed water output port of the temperature-controlled mixing valve ； Then, quickly turn the temperature setting knob counter-clockwise to a scale position above 38°C; the output port of the temperature control mixing valve should immediately stop the supply of cold water. In the event of leakage, the flow rate should be <100 mL/min; this test is intended to assess the strength of the return spring. 4. Test of the high-temperature function for mixed water output: Rotate the temperature control knob of the mixed water valve to the highest temperature setting, and turn on the flow switch of the valve – the temperature of the water coming out of the output port should be within 55°C. This test reflects whether the regulator accurately controls the clearance for the expansion stroke of the temperature sensor rod. 5. Testing of safety protection functions: Set the adjustment knob for the output temperature of the thermostatic mixing valve to “38°C”. Turn on the flow switch of the thermostatic mixing valve; once the output temperature of the mixed water stabilizes at 38°C, simulate a disruption in the cold water supply by quickly shutting off the cold water input to the testing device. The mixed water output port should cease to deliver hot water within 2 seconds. The time it takes to stop the hot water flow is related to its temperature – the higher the temperature of the hot water, the shorter the time required to shut it off, and the more complete the shutdown will be. When the temperature of the hot water supply is low, the leakage rate at the mixed water output port should not exceed 100 mL/min. After the cold water supply is turned on again, the output temperature of the mixed water from the temperature-controlled mixing valve should be able to stabilize back at its original set value of 38°C, with a deviation within ±1°C. This test not only reflects the expansion force and response speed of the temperature sensor rod, but also helps to detect quality defects in the manufacturing of the main unit and its components. 6. Testing of the automatic adjustment function for the output temperature of the mixed water: Connect the cold and hot water supplies to the corresponding inlet ports of the temperature-controlled mixing valve, and install separate pressure relief and shunt valves on each of the cold and hot water supply lines.