What is the difference between single-leaf and double-leaf check valves? How to determine which one to use in a particular location?
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What is the difference between single-leaf and double-leaf check valves? How to determine which one to use in a particular location?
Single valve disc: Used for ball passing. Features: High precision required in manufacturing, but good sealing performance; it operates without springs relying on its own weight, resulting in low pressure drop； Double valve discs: Resetted by springs, simple to manufacture; do not allow ball passage, result in high pressure drop due to the shaft in the middle, and have slightly poor sealing properties
If the property owner has no special requirements and ball testing is not necessary, then a cheaper double-disc valve is sufficient
Oh, the actual function is the same; the difference lies in sealing performance and price. Thank you
Regarding the single-valve disc and double-valve disc types of check valves mentioned by the poster, I only know that check valves meet these criteria. As for check valves, their general purpose is to prevent the medium from flowing back! You can only enter, not exit.
Isn’t a one-way valve just a check valve? As for the choice between single-leaf and double-leaf valves, I’m not sure whether it’s based on economic considerations, certain process requirements, or whether there are any differences in their functions
Technically, making a check valve is not very difficult; what really matters for differentiation is, on the one hand, the required structural length, and on the other hand, cost-effectiveness!
So can I understand it this way: a single valve disc requires specific installation dimensions, is more expensive, but offers better sealing performance; a double valve disc doesn’t require any specific installation dimensions, is cheaper, but has relatively poorer sealing performance?
It cannot be understood in that way. For example, for a single-disc swing check valve that meets American standards, the structural length of a 150Lb-DN50 model is 203 mm. For a double-disc swing check valve with the same specifications and pressure rating, its structural length is 60 mm. The sealing performance is the same, and its performance under normal temperature conditions is also identical; it simply depends on what structural length the customer needs to suit his pipeline requirements. The effect is the same. As for the price, ordinary swing-type single-disc valves are a bit cheaper.