High-temperature valve material

First, you need to know what a high-temperature valve is. Generally, we will work a temperature greater than 450℃ valve into a high-temperature valve. The general operating temperature is greater than 450℃ valve material, known as high-temperature valve material. Common high-temperature valve materials are: ZG1Cr18Ni9Ti, Cr-Ni heat-resistant alloy, CF8Ti(321), CF10Ti(321H), Cr-Mo cast steel, CF8M, CK-20, ZG0Cr19Ni11Ti, CF3, CF3M, CF8, HK-30, HK-40, 304, 304H, WC6(medium is water or steam), WC9(medium is water or steam), C5(ZG1Cr5Mo), 310 high-crni rust-resistant steel, 310H high-crni rust-resistant steel, etc

High-pressure valve material

How much more than that is a high-pressure valve? A basic consensus in the valve industry is that pressure between 10MPa and 80MPa is called a high-pressure valve. Common high-pressure valve materials include: Carbon steel A105/WCB, 1Cr13, 2Cr13, 3Cr13 chromium stainless steel, stainless steel 304, Cr18Ni12Mo2Ti, 316, WC6, WC9, 15CrMoG/15CrMoV, 321, ZG15Gr1Mo1V, ZG20CrMoV, 347, 40Cr(chromium steel), 1Cr5M0, F51, ZGCr5Mo, Cr17Ni2, F91, CF8, Cr17Ni2, CF3, 1Cr18Ni9Ti, 12CrMoV, CF8M, PH15-7Mo precipitation hardeningSteel, CF3M, Cr18Ni12Mo3Ti, alloy steel F5, F11, F22, low temperature steel LF2, LF3, LCB, etc.

Above are the common high-temperature valve materials and high-pressure valve materials.

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Chinese Name: Backwater Temperature Regulation Method for Hot Water Heating System

Foreign Name: the return water temperature regulation of hot water heating system

Purpose: To adjust the operating flow of thermal users to the ideal flow rate.

Field: Heating Regulation

Characteristic: Suitable for pipeline network without regulating valve

Regulation theory

When the heating system runs in a stable state, if the loss along the pipeline network is not considered, the heat supplied by the heat medium to the indoor heat dissipation equipment should be equal to the heat dissipation of the heat dissipation equipment and the heat load of the heating user. The heat supplied by the pipe network to the indoor heat dissipation equipment is equal to the product of its flow rate, the temperature difference between supply and return water and the specific heat of hot water. When the actual flow rate is larger than the design flow rate, the temperature difference between supply and return water decreases and the return water temperature is higher than the specified value. When the actual flow rate is less than the design flow rate, the temperature difference between supply and return water increases, and the temperature of return water is lower than the stable value.

Therefore, as long as the return water temperature of each user is equal (when the water supply temperature is equal) or the temperature difference between the supply and return water is equal (the insulation effect of the pipeline is poor, the water supply temperature is slightly different), the heat users can get the heat corresponding to the heat load and achieve the goal of uniform regulation.

This method is the simplest, primitive and time-consuming one.

It can be used in any heating system. It does not require the type of valves, pressure gauges and thermometers. It only needs an infrared thermometer or a digital surface thermometer.

(1) Determination of regulating temperature

When the heat supply of the heat source is greater than or equal to the user’s heat load and the flow rate of the circulating pump is greater than the design flow rate, considering the energy-saving operation of the circulating pump, the user’s return water temperature should be adjusted to the return water temperature corresponding to the temperature regulation curve. When the heat supply of heat source is greater than or equal to the user’s heat load and the flow of circulating pump is less than the designed flow rate, the average temperature of supply and return water should be adjusted to the average temperature of supply and return water corresponding to the temperature regulation curve. When the heat supply of heat source is less than the user’s heat load, the user’s return water temperature should be adjusted to a little lower than the total return water temperature.

(2) Regulation process

Because of the large thermal inertia of the heating system, the temperature changes obviously after the belt. After adjusting the flow rate of the system, the temperature of the system can not reflect the change of the flow rate in time, so the adjustment of the valve opening has a certain degree of experience. The measurement temperature should be adjusted by all users after a period of time. The interval time is related to the size of the system. When the total backwater temperature is stable at a certain value, the next round of adjustment can be made.

Firstly, the backwater temperature of each user is recorded and compared with the total backwater temperature. The higher the temperature, the smaller the valve closes. Under the same backwater temperature difference between users, the bigger the pipe diameter, the more closed it is. In the first round of adjustment, the proximal end user valve should close excessively. Record the number of valve closing cycles for each user.

After the first round of adjustment is completed, the user’s return water temperature is recorded after the total return water temperature is stable and unchanged, and compared with that before adjustment, and then compared with the total return water temperature for the second round of adjustment. The interval between the first and second rounds should be more than twice the time required for the furthest user to return water to the heat source after the first adjustment. Estimates are made according to the flow rate of the network and the longest user pipe length, and so on.

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Principle of thermostatic balancing valve:

A high sensitive memory alloy module is arranged at the outlet. The temperature sensing of the memory alloy module changes the flow rate of hot and cold water through elongation and contraction to reach the water flowing out of the set temperature. By controlling the inlet flow of heat exchanger, air conditioning unit or other heat, cooling equipment and primary heat (cold) medium, the outlet temperature of equipment can be controlled. When the load changes, the flow rate can be adjusted by changing the opening degree of the valve to eliminate the impact of load fluctuation and restore the temperature to the set value.

Constant temperature valves include bath constant temperature faucets and radiator constant temperature valves.

Bath thermostat faucet

As a new type of valve, the constant temperature valve replaces the common cold and heat regulating water valve, and solves the problems of water temperature and heat which are difficult to adjust due to the rapid change of pressure and temperature in the process of bathing. When using, only need to open the switch to flow out the constant temperature water. Press the red safety button when adjusting the temperature. Slowly adjust the temperature setting counterclockwise to avoid discomfort caused by too fast temperature rise.

Radiator thermostat

It is mainly used for automatic control of heat balance of hot water heating system and equipment. Solve the problem of thermal and hydraulic imbalance in heating system caused by different length of pipes between buildings, different size of heat dissipation area, different resistance caused by different pipe structures, different pressure difference and different amount of heat dissipation.

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