Suck Back Valve Synchronization Prevents Water Hammer
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Solution Overview
Problem
The suck back valve system with an integral-type suck back valve and a protective on/off valve experiences issues with liquid dripping due to water hammer during the closing operation, as the protective on/off valve is not synchronized effectively with the integral-type suck back valve.
Innovation Solution
Implementing an opening and closing control unit that ensures the protective on/off valve completes its fully closing operation earlier than the integral-type suck back valve during the fully closing operation, utilizing a second pneumatic actuator and solenoid valves with adjustable air pressure flow-rate to synchronize the closing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective on/off valve is closed at the same time as the integral-type suck back valve, then the protective measure against malfunction is activated, but water hammer occurs causing liquid dripping from the suck back valve
Solution Approach 1:
The control unit closes the protective on/off valve before closing the integral-type suck back valve. This preliminary action ensures that when the suck back valve closes, the protective valve is already closed, preventing water hammer from occurring at the suck back valve while maintaining the protective function.
2Object-generated harmful factors
If the protective on/off valve is closed earlier than the integral-type suck back valve, then water hammer is prevented, but the synchronization between valves is not optimal
Solution Approach 1:
The control unit dynamically adjusts the closing timing of the protective on/off valve relative to the integral-type suck back valve. By making the protective valve close earlier, the system dynamically prevents water hammer while maintaining effective protective function, optimizing the timing based on the harmful effect prevention requirement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This synchronization prevents water hammer and subsequent liquid dripping by ensuring the protective on/off valve is fully closed before the integral-type suck back valve, thereby enhancing the suck back function and reducing fluid outflow.
Implementation Method 1
an on/off valve that performs opening and closing operations by a first pneumatic actuator
Implementation Method 2
liquid sometimes drips from the integral-type suck back valve due to the influence of water hammer
Data Source
AI summary
There is provided a suck back valve system in which problems in the suck back function are resolved. In a suck back system including an integral-type suck back valve in which an on/off valve that performs opening and closing operations by a first pneumatic actuator has a suck back function of preventing liquid dripping by means of a diaphragm that moves with the closing operation and a protective on/off valve provided at the upstream side adjacent to the integral-type suck back valve as a measure against malfunction in the integral-type suck back valve and performing opening and closing operations by a second pneumatic actuator, an opening and closing control unit is provided that, during the fully closing operation of the integral-type suck back valve, completes the fully closing operation of the protective on/off valve earlier than full closing of the integral-type suck back valve.