Hydraulic control valve concept: Hydraulic control valve is a water pressure control valve, which consists of a main valve and attached to the catheter ﹑ Pilot valve ﹑ ﹑ valve and pressure gauges and other components. Hydraulic control valve types: According to the purpose of use, function and place can be evolved into a remote control float valve, pressure reducing valve, slow closing check valve, flow control valve, pressure relief valve, hydraulic electric control valve, pump control valve. According to the structure can be divided into two types of diaphragm and piston. Hydraulic control valve diaphragm type and piston type two types of valves work the same principle, are based on the upstream and downstream pressure difference △ P as the power by the pilot control, so that the diaphragm (piston) hydraulic differential operation, fully automatic adjustment by the hydraulic, So that the main valve disc fully open or completely closed or in regulation. When the pressure water entering the control chamber above the diaphragm (piston) is vented to the atmosphere or downstream low pressure zone, the pressure acting on the bottom of the valve disk and under the diaphragm is greater than the pressure above, pushing the main valve disk fully open (Piston) above the control chamber pressure water can not be discharged to the atmosphere or the lower reaches of the lower pressure zone, the role of pressure on the diaphragm (piston) is greater than the pressure value below, it will be the main valve disc Pressure to the fully closed position; when the pressure value in the control chamber above the diaphragm (piston) is between the inlet pressure and the outlet pressure, the main valve disc is adjusted and its position of adjustment depends on the needle valve and the adjustable Pilot valve joint control. Adjustable pilot valve through the downstream outlet pressure and with its changes to open or close its own small valve port, thereby changing the diaphragm (piston) above the control room pressure value, control valve plate valve position adjustment.
Yellowing Resistance Test Chamber
A yellowing resistance test chamber is a specialized piece of equipment used to evaluate the yellowing resistance of materials. It is commonly used in industries such as automotive, aerospace, and construction to assess the long-term color stability of materials exposed to various environmental conditions.
The test chamber simulates accelerated aging conditions by subjecting the material to controlled levels of heat, humidity, and UV radiation. These factors can cause materials to undergo yellowing or discoloration over time, which can negatively impact their aesthetic appeal and performance.
During the test, samples of the material are placed inside the chamber, and the temperature, humidity, and UV exposure levels are adjusted according to the desired testing parameters. The samples are typically monitored over a specified period, and any changes in color or yellowing are visually assessed.
The yellowing resistance test chamber helps manufacturers determine the durability and color stability of materials, allowing them to make informed decisions regarding product development and quality control. It can also be used to compare the yellowing resistance of different materials or evaluate the effectiveness of protective coatings or additives in preventing yellowing.
Overall, the yellowing resistance test chamber is an essential tool for industries that rely on materials with long-lasting color stability, ensuring that products maintain their desired appearance even after prolonged exposure to harsh environmental conditions.
Dongguan Best Instrument Technology Co., Ltd , https://www.best-tester.com
