The valve that does not meet the corresponding requirements of ASME/ANSI B16.42 or ANSI/AWWWA C504 should be determined by the minimum wall thickness. This minimum wall thickness is determined by the use of design and using these standards. Essence

The replacement method does not meet the valve of the corresponding requirements determined by ASME/ANSI B16.42 or ANSI/AWWA C504 corresponding requirements. The reduced valve wall thickness between the valve body and the adjacent bolt hole of the valve body should not be less than 25%of the wall thickness required by the neck of the valve body.

 For the vessel valve connected to the flange connection, if the materials listed in the French standards in Section 2 are not used, the minimum flange thickness should be used to determine Essence For the consideration of flange, minimum flange thickness should never be less than the values ​​listed in the standard.

Pressure rated value is designed for its truncated pressure rated value or pressure difference than the valve body pressure rated value, and the valve can be designed. This pressure rated value shall be marked in accordance with the provisions of Section 12 of this standard. The flange level that does not list in the Versey Frank standard exceeds the scope of this standard.

The flange bolt 5.4 The flange bolt hole of the valve body is the cast iron, the ball ink cast iron, and the non -ferrous metal ship's valve. There should be a bolt hole of the 2B -level drilling hole and the attack wire according to the ASME B1.1 coarse dental threaded series. All -level steel valves for the screw holes are scheduled to use the screw holes. For the bolt with a specification of 1 inch less than the same as the specifications of the ASME B1.1 thick tooth series 2B drilling and attack wire; 1 '/A -inch bolt is based on the 8 -tooth series 2B drilling and attack wire.

امتیاز بدهید :

The valve that does not meet the corresponding requirements of ASME/ANSI B16.42 or ANSI/AWWWA C504 should be determined by the minimum wall thickness. This minimum wall thickness is determined by the use of design and using these standards. Essence

The replacement method does not meet the valve of the corresponding requirements determined by ASME/ANSI B16.42 or ANSI/AWWA C504 corresponding requirements. The reduced valve wall thickness between the valve body and the adjacent bolt hole of the valve body should not be less than 25%of the wall thickness required by the neck of the valve body.

 For the vessel valve connected to the flange connection, if the materials listed in the French standards in Section 2 are not used, the minimum flange thickness should be used to determine Essence For the consideration of flange, minimum flange thickness should never be less than the values ​​listed in the standard.

Pressure rated value is designed for its truncated pressure rated value or pressure difference than the valve body pressure rated value, and the valve can be designed. This pressure rated value shall be marked in accordance with the provisions of Section 12 of this standard. The flange level that does not list in the Versey Frank standard exceeds the scope of this standard.

The flange bolt 5.4 The flange bolt hole of the valve body is the cast iron, the ball ink cast iron, and the non -ferrous metal ship's valve. There should be a bolt hole of the 2B -level drilling hole and the attack wire according to the ASME B1.1 coarse dental threaded series. All -level steel valves for the screw holes are scheduled to use the screw holes. For the bolt with a specification of 1 inch less than the same as the specifications of the ASME B1.1 thick tooth series 2B drilling and attack wire; 1 '/A -inch bolt is based on the 8 -tooth series 2B drilling and attack wire.

امتیاز بدهید :

Pneumatic valve is a kind of valve. There will be some problems in the process of use, including the pneumatic valve is not closed tightly, what is the reason for the pneumatic valve not closed tightly? How to solve this problem?

1. Incorrect selection of control valve: Different types of custom brass fitting  control valves allow different pressure differences. Sleeve control valves and double-seat control valves allow larger pressure differences than single-seat control valves. Angular stroke V-shaped control ball valves and eccentric rotary valves The allowable differential pressure will be larger. In the case of relatively large pressure difference, reasonable selection is very important.

2. There are impurities inside the regulating valve, and foreign objects cause jamming: it is necessary to disassemble the valve cover of the regulating valve, take out the valve core, and clean it. If the sealing surface is damaged, it must be reground and assembled. The inlet of the regulating valve is preferably equipped with a filter, which can reduce the occurrence of similar situations.

3. Insufficient output force of the pneumatic actuator: As the power part of the pneumatic actuator to drive the action of the valve core of the regulating valve, its output force must be greater than the force required when the valve is closed, otherwise it will not be closed tightly, and the valve core will be pushed open by the medium pressure , resulting in inteal leakage. Therefore, it is necessary to verify the differential pressure value of the process pipeline when selecting the model to ensure that the pneumatic actuator has sufficient output force to close the valve.

4. Valve core damage caused by cavitation flashing: Weld the valve core and valve seat with STL hard alloy, and choose a cavitation-resistant flashing control valve reasonably to reduce its occurrence.

5. The spring stiffness of the diaphragm actuator of the air-opening control valve is not enough: the air-opening diaphragm control valve relies on the spring force to close the valve. The driving force required for opening is small, and the force required for closing is larger. The pressure difference between the front and rear of the valve, when the force of the spring is not enough to overcome the pressure difference force, will cause the situation of loose closing, which needs to be solved by replacing the spring with high stiffness.

امتیاز بدهید :