Treatment: Shunts
Differential pressure valve
A differential pressure valve is a common type of shunt valve that opens when the pressure difference across it reaches a set level.
In short: Differential pressure valve
- It opens based on the pressure difference across the valve.
- It is a common, basic type of shunt valve.
- It comes in different pressure settings (low, medium, high).
- It does not adjust for body position on its own.
What it is
A differential pressure valve is a common type of shunt valve that opens to allow CSF to flow when the difference in pressure across the valve (between the inlet and outlet) reaches a set level. It is one of the basic, widely used valve designs.
Understanding Differential pressure valve
This valve is set to open at a particular pressure difference — available in options often described as low, medium, or high pressure — to control drainage. When the pressure on the inlet side (from the ventricle) exceeds the outlet side by the set amount, the valve opens and CSF flows. A limitation is that a simple differential pressure valve does not, on its own, account for the effects of body position (such as the siphoning that occurs when upright), which can contribute to overdrainage; this is why some shunts add antisiphon or gravitational features. The choice of valve type and setting is individualized to balance adequate drainage against overdrainage.
Why it matters
Understanding the differential pressure valve helps families see how a basic shunt valve controls flow based on pressure, and why additional features may be added to manage the effects of body position.
Common questions
How does a differential pressure valve work?
It opens when the pressure difference across it reaches a set level.
Does it come in different settings?
Yes — often low, medium, or high pressure.
Does it adjust for body position?
Not on its own — other features manage that.
Bottom line
A differential pressure valve opens at a set pressure difference to control shunt drainage but does not adjust for body position on its own.
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