1. What are the three main factors that should be considered in the selection of an implementing agency?
Valves experience answers：
1) The output of the actuator should be greater than the load of the valve and be reasonably matched.
2) When checking the standard combination, consider whether the allowable pressure difference specified by the valve meets the process requirements. When the pressure difference is large, the unbalanced force on the valve core is calculated.
3) It is necessary to consider whether the response speed of the actuator meets the requirements of process operation, especially the electric actuator.
2. Compared with pneumatic actuators, what are the characteristics of electric actuators, and what are the output forms?
Valves experience answers：
The electric drive source is simple and convenient for electricity, with large thrust and torque and high rigidity. But the structure is complex and the reliability is poor. It is more expensive than pneumatic in small and medium specifications. It is often used in occasions where there is no air source or does not require strict explosion-proof and flame-proof. The electric actuator has three output forms: angular stroke, straight stroke, and multi-rotation.
3. Why is the shut-off pressure difference of the quarter-turn valve large?
The shut-off pressure difference of the quarter-turn valve is large because the resultant force generated by the medium on the spool or valve plate has a very small torque on the rotating shaft, so it can withstand a large pressure difference.
Butterfly valves, ball valves are the most common quarter turn valves.
4.Which valves need to be selected for flow direction? How to choose?
Single-seal control valves such as single-seat valves, high-pressure valves, and single-seal sleeve valves without balancing holes need to be selected for flow direction.
There are advantages and disadvantages to opening and closing flow. The valve of the flow open type works relatively stably, but the self-cleaning performance and sealing performance are poor, and the service life is short; The valve of the flow-closed type has a long life, good self-cleaning performance and sealing, but poor stability when the stem diameter is smaller than the diameter of the spool.
Single-seat valves, small flow valves, and single-seal sleeve valves usually have a selective flow open, and can be selected when the scouring is severe or there are self-cleaning requirements. Two-position quick-opening characteristic regulating valve selective closed type.
Valves often encounter problems and Valves experience answers, from selection, use to maintenance
Introduction
Valves are integral components in various industrial processes, serving as gatekeepers for the flow of fluids and gases. Whether in manufacturing, energy production, or water treatment, valves play a crucial role. However, they are not immune to problems that can hinder their efficiency and longevity. This post explores some of the common issues valves encounter and offers solutions, encompassing everything from valve selection to maintenance.
- Valve Selection
Choosing the right valve for a specific application is the first critical step. Common problems stem from inappropriate valve selection, such as:
- Valve Installation
Once you’ve chosen the correct valve, proper installation is paramount:
- Valve Operation
Even with the right valve and proper installation, issues can arise during operation:
- Valve Maintenance
Maintenance is crucial to ensure the long-term performance of valves:
- Valve Testing and Monitoring
To catch issues early, implement regular testing and monitoring:
- Pressure Testing: Periodic pressure testing can help identify leaks and weak points in the valve system.
- Flow Monitoring: Monitoring flow rates and valve positions can reveal anomalies and potential problems.
Conclusion
Valves are essential components in various industries, but they are not immune to problems. Proper valve selection, installation, operation, maintenance, and monitoring are key to avoiding common issues. By addressing these aspects comprehensively, you can ensure that valves perform efficiently and have a longer service life. Regular inspections and a proactive approach to valve management will lead to smoother operations and reduced downtime, ultimately benefiting your industrial processes. Remember, the right valve, maintained and operated correctly, is the key to success in fluid and gas control systems.
