Static characteristic refers to the dynamic connection between valve path and output signal, also known as dynamic characteristic. The above is the basic definition of the static characteristics of various ethnic groups. 1. Fundamental error In a regular reference environment, the maximum difference between the characteristic straight line of the actual route and the characteristic straight line of the regular route is called the fundamental error.

2. The starting point and the starting point are biased towards the starting point.  wholesale Brass Faucet Valve  The bias is also called the two-point error, and the bias at the starting point is also called the starting point error. When the measuring tool is working in a regular operating environment, when the output is the upper and upper limit values ​​of the signal range, the error of the response path value of the adjustment valve is called the deviation of the starting point and the starting point. The starting and starting point deviations use the percentage of the extra distance of the adjustment valve to indicate the extra distance deviation. When the measuring tool is working in a regular operating environment, the error when the output exceeds the lower limit value of the signal range is called the extra distance deviation.

3. Hysteresis is the maximum difference between the two echo distance values ​​of the same output signal falling and falling. 4. The forward and reverse position changes of the dead zone output signal will not cause any perceptible change in the infinite interval (Figure " # ").

5. Repeatability In the same working environment, the difference between the input values ​​measured repeatedly at the same position for the same output value is called repeatability. The repeat function indicates the size of the random error of the gage. The repeatability of the regulating valve is determined by the maximum repeatability error measured by each output value in the whole range. Repeatability does not include hysteresis and hysteresis.

6. Reproducibility In the opposite working environment and regular time, the level of divergence between input values ​​measured repeatedly from two identical positions for the same output value is called reproducibility. Reproducibility includes deadband, hysteresis, drift and repeatability. Reproducibility is determined by the maximum difference between the corresponding drop and drop input values ​​measured repeatedly for the same output value over the entire range, and is expressed as a percentage of the range. 7. Linearity error The maximum deviation between the calibration straight line and the appropriate curve (Golden Rooster independent curve, zero-base curve, end-base curve) is the linearity error. In the entire output signal range, for the two positions of falling and falling, the default setting is performed twice, and at the default point of each output signal, the average value of each data is obtained, and the average line and curve drawn by the point are used. The largest difference between them is the linearity error.

The gas safety valve plays the role of safety protection in the system. When the system pressure exceeds the specified value, the safety valve is opened, and all the gas in the system is discharged into the air, so that the system pressure does not exceed the allowable value. The means is that the system does not cause an accident due to excessive pressure.

The gas safety valve is commonly known as the overflow valve. The nominal pressure of the gas safety valve is determined by the operating pressure, and the scope of application measurement is also determined by the operating pressure. The constant pressure range of the spring or lever is determined by the constant pressure value of the safety valve to be entered, and then the material and structure of the gas safety valve are determined according to the use medium, and then the throat diameter of  brass gate valves the gas safety valve is determined according to the gas safety valve leakage. Notes on safety valve selection

1. Gas safety valves with handles that are not opened are mostly used on hot water boilers. 2. The full-open safety valve with handle is not opened and is normally used in steam boilers or steam ballistics. 3. There is no compressible medium for solids such as water, normally open the micro-opening safety valve. 4. The low-pressure feedwater normally uses a full-open safety valve, similar to: low-pressure feedwater heater and heat exchanger. 5. The static-weight safety valve is normally used in E-class steam boilers. 6. The insurance heating valve is used on the liquid-phase heating trajectory at the inlet of the tank pump of the weathered gas station oil and gas station. 7. For vessels with stable back pressure and toxic and explosive or pipeline systems, the normal use of ripples must be dangerous. 8. Negative pressure or vacuum negative pressure safety valve for normal systems that may generate negative pressure during operation. 9. Large-diameter, large-displacement and low-pressure systems are normally used for pulse-type safety valves, such as temperature reduction and pressure reduction installations, power station boilers, etc.

1. Scope of application of Q41F4 flanged fluorine-lined ball valve This standard applies to flanged or butt welded ball valves. These valves generally have (but are not limited to) circular passages, and the passages have full diameter, regular diameter or reduced diameter. The following provisions shall be incorporated into the standard, unless otherwise agreed by the manufacturer and the purchaser. Valves conforming to this standard are generally suitable for liquids and gases. The pressure and temperature that the valve is suitable for generally meet the standards listed in Section 2, but may also be limited by the valve seat and sealing material or other special factors.
1.3 The valve specifications to which Brass Check Valve  this standard applies are NPS 1/2 to NPS 36. 1.4

This standard applies to ball valves of the following materials: carbon steel, alloy steel, stainless steel, ductile iron and bronze. 1.5 The designations of common valve body types are given in Figure 1. When the valve body type is changed or other types of valve body are adopted, the name of the type can be determined by the manufacturer. The names of the main parts of the fluorine-lined ball valve are given in Figure 2, and the names of other parts can be determined by the manufacturer. Body type and valve components may also be identified in accordance with applicable MSS standards or other technical standards. 2. Working pressure rating

2.1 The pressure and temperature ratings of flanged and butt welded ball valves shall comply with the following standards, unless the fluorine-lined ball valve is limited by its seat and sealing material. ANSI/ASME B16.5--1988 and ANSI/ASME B16.34--1988. 2.1.1 Carbon Steel Alloy Steel ANSI/ASME B16.5- 1988 and ANSI/ASME B16.34-1988. 2.1.22.1.3 Stainless Actinium ANSI/ASME B16.5-1988 and ANSI/ASME B16.34--1988. ANSI/ASME B16.42--1987. 2.1.4 Ductile Iron ASME B16.24--1991. 2.1.5 Bronze 2.2 Constant Working Pressure (CWP) Normal temperature working pressure ratings for valve housings and components. For carbon steel , alloy steel, stainless steel and ductile iron are rated at 100F (38C). For bronze, the rated pressure is 150F (66C). The maximum working pressure at any other temperature should not exceed this rated pressure. 3. Fluorine-lined ball valve channel size 3.1 The channel of the ball valve can be full diameter, regular diameter or reduced diameter. The minimum hole diameter of full-bore valves should be in accordance with ANSI/ASME B16.34 for ball valves with a size less than or equal to NPS 30; for ball valves with a size greater than NPS 30, it should be agreed between the manufacturer and the buyer. 3.1.2 The hole diameter of regular diameter and reduced diameter ball valve is smaller than that of full diameter ball valve, and its diameter should be listed in Table

1. 1. Material Valve housing refers to the parts that bear the pressure in the pipeline but does not include balls, valve seats, seals and other parts. This standard covers only pressure-bearing bolted connections, excluding mechanical connections and bolted connections for end flanges. Recommended valve body and bolting materials meet the specifications listed in Sections 2.1.1 through 2.1.5. When using alternative materials, the marine valve manufacturer should be able to prove that these alternative materials can at least meet the intended use requirements according to the documents provided by the material manufacturer or the approved supplier.

①The structure of the center line butterfly valve The center line sealing butterfly valve is that the entire butterfly plate and the valve seat are concentric within 360° of the circle, with two-way sealing performance, and the flow rate can be adjusted freely. Most of the centerline butterfly valves are of an interference seal type, that is, a rubber liner is inserted on the valve seat of the valve body. If the medium is more corrosive, PTFE can be suppressed, and rubber is lined on the back of the PTFE to increase resilience. The ballast ring can be replaced, it can also be glued to the valve body, and the ballast ring can be placed on the butterfly plate. The flange surface of the rubber liner is also a seal to the pipe flange. If a rubber gasket is added between the two flange surfaces when installing this valve, it will affect the sealing performance of the rubber ring.Bronze Gate Valve gate valve manufacturersTherefore, it is not necessary Superfluously. Since the centerline sealing butterfly valve is an interference mandatory sealing form, the applicable pressure is limited, and it is usually used under working conditions not greater than PN10. But for water supply and drainage pipes, this is enough.
②Eccentric butterfly valve structure The general butterfly valve has a single eccentric or double eccentric structure. The purpose of eccentricity is to separate the valve seat and the sealing surface after the butterfly plate is opened to about 20°, thereby reducing friction. The double eccentric structure is designed to deviate the shaft from the center line of the sealing surface to form a first eccentricity; the shaft slightly deviates from the center line of the pipeline to form a second eccentricity. The purpose of these two eccentricities is to reduce the friction between the valve seat and the sealing ring during the valve switching stroke.
The triple eccentric metal sealing butterfly valve adds an eccentric angle β on the basis of double eccentricity, which not only utilizes the original cam effect, but also completely eliminates the friction between the valve seat and the sealing ring during the 90° stroke. The first eccentric shaft deviates from the centerline a of the sealing surface. Butterfly valves designed and manufactured according to this principle are usually called single-sided eccentric butterfly valves. The second eccentric—the shaft slightly deviates from the pipeline and the valve centerline b, and the butterfly valve designed and manufactured according to the principle of one eccentricity and two eccentricity is usually called a double eccentric butterfly valve.
The third eccentric ——The triple eccentric structure has one more eccentric angleβ than the double eccentric structure, and the sealing surface of the butterfly plate adopts an eccentric cone. From the geometric shape, the butterfly plate and the sealing ring are completely separated in the whole switching stroke of the valve. This unique eccentric combination not only makes use of the cam effect, but also completely eliminates friction, so that during the 90° stroke of the valve, there is no friction between the butterfly plate and the seat sealing ring, eliminating the problem of wear and leakage. The triple eccentric metal sealing butterfly valve optimizes the contact characteristics between the butterfly plate and the seat sealing ring. The contact angle of most butterfly valves is 3°～12.5°, this range is the lock taper range, which will produce high sealing torque and opening torque. The contact angle of the sealing surface of the triple eccentric metal seal butterfly valve is greater than the locking taper range, which eliminates the possibility of jamming from the geometric shape, thereby ensuring that the torque required for valve switching will not change greatly during the valve's entire service life.
Features of butterfly valve
①Compared with other valves of the same specification and same pressure level, the butterfly valve has short structure length, small size, light weight and simple structure.
②Quick opening and closing, easy operation, can be used as a fast opening and closing valve.
③It has good flow adjustment function and closed sealing performance, long service life, and can be used as a regulating valve.
④It is suitable for large-diameter valves and is widely used in large-scale water supply and drainage pipelines.

AVP provides a valve position feedback unit as an optional accessory, and users can monitor the valve's movement in order to find problems early.

Self-diagnosis
AVP provides a self-diagnostic program to ensure that the fault of the regulating valve is quickly determined.

4. Suitable for single-acting/double-acting actuators at the same time (double-acting function is optional)

Through the inverting amplifier, AVP can be applied to double-acting actuators.

Self-tuning of internal switches

Steps:

1. Adjust the air source of the filter pressure reducing valve to the rated value of the execution structure, and input a signal of 18mA±1 mA to AVP100

2. Press the "UP" key for 3 seconds Custom Bibcock Manufacturers until the valve moves and auto-tuning starts, then release the button

3. The valve knows to perform full-open-full-close back and forth twice, and then stop at about 50% of the opening, and then stay at the opening position of the input signal (18mA). The whole process takes about 3 minutes

4. After changing the input signal, check the opening and auto-tuning is complete

5. When the auto-tuning is in progress, if the input signal is lower than 4mA, the auto-tuning is interrupted and the auto-tuning must be restarted. After the auto-tuning is completed, keep the input signal above 4mA for at least 30 seconds before the auto-tuning parameters can be stored in the AVP.

6. During the auto-tuning process, if you connect the SFC handheld programmer (pay attention to the positive and negative poles) to the AVP, press the ID key on the SFC handheld programmer, and the auto-tuning parameters can be displayed on the SFC LCD screen.