[Daily question 20090406] Pneumatic control valve knowledge
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1. Turning down the cut-off valve in series with the regulating valve will cause the adjustable ratio to change ( ) and the flow characteristics to change ( ). 2. For the adjustable ratio, the impact of the shut-off valve is greater than that of the bypass valve ( ). On the flow characteristics, the impact of the shut-off valve is greater than that of the bypass valve ( ). 3. The positive effect of the regulator generally refers to the increase in measurement and output ( ) ； The reaction of the regulator is to increase the measurement and output ( ). 4. The ideal adjustable ratio depends on (). The actual adjustable ratio depends on ( ) and ( ). 5. The R value of the straight-through single- and double-seat control valves produced in my country is ( ). 6. Relative flow rate of the regulated medium flowing through the valve/Qmax] Relative stroke to the valve 1/L] The relationship between is called the regulating valve ( ). When the pressure difference between the front and rear of the valve remains unchanged, the above relationship is called ( ). In actual use, the pressure difference before and after the valve always changes. At this time, the above relationship is called (). 7. The pressure difference between the front and rear of the regulating valve is small, and if the leakage is to be small, the () valve can generally be used. To adjust low pressure difference and large flow gas, you can choose () valve. To regulate highly corrosive fluids, the () valve can be used. When both adjustment and cut-off are required, the () valve can be used. When the noise is large, the () valve can be used. This post was last edited by Mobei Yihai on 2009-4-6 13:44 ]
1: Small, poor 2: small, big 3: increase, decrease 4: Valve core structure, valve core structure, piping condition 5: 30 6: Flow characteristics, ideal flow characteristics, working flow characteristics 7: Single seat, butterfly, diaphragm, eccentric rotation, sleeve
1. Turning down the cut-off valve in series with the regulating valve will cause the adjustable ratio to become (small) and the flow characteristics to become (poor). 2. For the adjustable ratio, the shut-off valve has a smaller (smaller) impact than the bypass valve. On the flow characteristics, the impact of the shut-off valve is worse than that of the bypass valve. 3. The positive effect of the regulator generally refers to the increase in measurement and output (increase) ； The reaction of the regulator means that the measurement increases and the output (decreases). 4. The ideal adjustable ratio depends on (valve core structure). The actual adjustable ratio depends on (spool structure) and (piping conditions). 5. The R value of the straight-through single-seat and double-seat control valves produced in my country is (30). 6. The relationship between the relative flow rate of the regulated medium flowing through the valve and the relative stroke of the valve is called the (flow characteristic) of the regulating valve. When the pressure difference between the front and rear of the valve remains unchanged, the above relationship is called (ideal flow characteristic). In actual use, the pressure difference before and after the valve always changes. At this time, the above relationship is called (working flow characteristic). 7. The pressure difference between the front and rear of the regulating valve is small, and if the leakage is to be small, a (single-seat) valve can generally be used. To adjust low pressure difference and large flow gas, a (butterfly) valve can be used. To regulate highly corrosive fluids, a (diaphragm) valve can be used. When both adjustment and cut-off are required, an (eccentric rotation) valve can be selected. When the noise is large, a (sleeve) valve can be used. This post was last edited by Mobei Yihai on 2009-4-6 16:59 ]
1. Turning down the cut-off valve in series with the regulating valve will cause the adjustable ratio to become (small) and the flow characteristics to become (poor). 2. For the adjustable ratio, the shut-off valve has a smaller (smaller) impact than the bypass valve. For flow characteristics, the shut-off valve has a greater (larger) impact than the bypass valve. 3. The positive effect of the regulator generally means that the measurement increases and the output (increase) ； The reaction of the regulator means that the measurement increases and the output (decreases). 4. The ideal adjustable ratio depends on (valve core structure). The actual adjustable ratio depends on (spool structure) and (piping conditions). 5. The R value of the straight-through single-seat and double-seat control valves produced in my country is (30). 6. The relationship between the relative flow rate of the regulated medium flowing through the valve and the relative stroke of the valve is called the (flow characteristic) of the regulating valve. When the pressure difference between the front and rear of the valve remains unchanged, the above relationship is called (ideal flow characteristic). In actual use, the pressure difference before and after the valve always changes. At this time, the above relationship is called (working flow characteristic). 7. The pressure difference between the front and rear of the regulating valve is small, and if the leakage is to be small, a (single-seat) valve can generally be used. To adjust low pressure difference and large flow gas, a (butterfly) valve can be used. To regulate highly corrosive fluids, a (diaphragm) valve can be used. When both adjustment and cut-off are required, an (eccentric rotation) valve can be selected. When the noise is large, a (sleeve) valve can be used. I hope there will be fewer daily questions like this from the test question set! Looking forward to original work. This post was last edited by LZ Gas Station on 2009-4-6 16:42 ]
1: The adjustable ratio becomes smaller and the flow characteristics become worse. This is because the S value of the regulating valve becomes smaller. 2: The impact of the shut-off valve should be small, and the impact of the shut-off valve should be large. 3: Output decreases, output increases. 4: Depends on the internal structure of the valve ； Depends on the internal structure of the valve and the S value. 5: 1: 30 6: The flow characteristics of the valve, the ideal flow characteristics of the valve, the working flow characteristics of the valve 7: Choose single-seat type, regulating butterfly valve, diaphragm regulating valve or single-seat valve with anti-corrosion lining, choose V-shaped ball valve or cam deflection valve, and choose multi-stage pressure reducing sleeve valve.
1. Turning down the cut-off valve in series with the regulating valve will cause the adjustable ratio to become (small) and the flow characteristics to become (poor). 2. For the adjustable ratio, the shut-off valve has a smaller (smaller) impact than the bypass valve. For flow characteristics, the shut-off valve has a greater (larger) impact than the bypass valve. 3. The positive effect of the regulator generally means that the measurement increases and the output (increase) ； The reaction of the regulator means that the measurement increases and the output (decreases). 4. The ideal adjustable ratio depends on (valve core structure). The actual adjustable ratio depends on (spool structure) and (piping conditions). 5. The R value of the straight-through single-seat and double-seat control valves produced in my country is (30). 6. The relationship between the relative flow rate of the regulated medium flowing through the valve and the relative stroke of the valve is called the (flow characteristic) of the regulating valve. When the pressure difference between the front and rear of the valve remains unchanged, the above relationship is called (ideal flow characteristic). In actual use, the pressure difference before and after the valve always changes. At this time, the above relationship is called (working flow characteristic). 7. The pressure difference between the front and rear of the regulating valve is small, and if the leakage is to be small, a (single-seat) valve can generally be used. To adjust low pressure difference and large flow gas, a (butterfly) valve can be used. To regulate highly corrosive fluids, a (diaphragm) valve can be used. When both adjustment and cut-off are required, an (eccentric rotation) valve can be selected. When the noise is large, a (sleeve) valve can be used.
1. Turning down the cut-off valve in series with the regulating valve will cause the adjustable ratio to become (small) and the flow characteristics to become (poor). 2. For the adjustable ratio, the shut-off valve has a smaller (smaller) impact than the bypass valve. For flow characteristics, the shut-off valve has a greater (larger) impact than the bypass valve. 3. The positive effect of the regulator generally means that the measurement increases and the output (increase) ； The reaction of the regulator means that the measurement increases and the output (decreases). 4. The ideal adjustable ratio depends on (valve core structure). The actual adjustable ratio depends on (valve core structure and piping conditions 5. The R value of the straight-through single- and double-seat control valves produced in my country is (30). 6. The relationship between the relative flow rate of the regulated medium flowing through the valve and the relative stroke of the valve is called the (flow characteristic) of the regulating valve. When the pressure difference between the front and rear of the valve remains unchanged, the above relationship is called (ideal flow characteristic). In actual use, the pressure difference before and after the valve always changes. At this time, the above relationship is called (working flow characteristic). 7. The pressure difference between the front and rear of the regulating valve is small, and if the leakage is to be small, a (single-seat) valve can generally be used. To adjust low pressure difference and large flow gas, a (butterfly) valve can be used. To regulate highly corrosive fluids, the () valve can be used. When both adjustment and cut-off are required, a (diaphragm) valve can be used. When the noise is large, a (sleeve) valve can be used.