Locking Gas Springs: Selecting the Right Type for Your Application
Locking gas springs are pneumatic struts equipped with an internal valve system that allows the spring to be locked at any position within its stroke, providing a secure hold for heavy lids, access hatches, or adjustable furniture. Unlike standard gas springs that rely on gas pressure alone, these units use a release pin mechanism that, when depressed, opens an internal valve to allow movement; once released, the piston is held fixed.
⚡ In a Rush? Key Takeaways
- Rigid locking springs prevent all movement, while elastic models allow minor deflection under load.
- Internal valve systems are rated for up to 100,000 cycles in high-usage industrial applications.
- Actuation force at the release pin typically ranges from 5N to 30N for manual operation.
- ✅ Always match the locking capacity to the static load of your specific application.
What Is the Difference Between Rigid and Elastic Locking?
Rigid locking gas springs hold position without any movement under load, while elastic locking springs allow slight compression under pressure.
How Do Rigid Locking Springs Function?
Rigid locking gas springs isolate the gas chamber entirely, preventing piston travel in both extension and compression directions under load.
Rigid locking mechanisms are essential for applications requiring zero movement, such as medical bed adjustments or precision equipment platforms. These springs use a mechanical seat that locks the piston rod firmly in place. When the release pin is activated, the hydraulic or gas chambers are bridged, allowing for smooth adjustment.
When Should You Use Elastic Locking Springs?
Elastic locking gas springs allow for minimal movement under high loads due to the compressibility of the nitrogen gas charge present.
Elastic locking springs are chosen for applications where a small amount of “give” is acceptable or even desirable to prevent component damage. In scenarios where a sudden shock load might otherwise strip a rigid locking mechanism, an elastic unit acts as a temporary buffer. These are frequently used in seating adjustments where user comfort is a priority over absolute rigidity.
- Use rigid locks for height-adjustable tables and medical carts.
- Use elastic locks for ergonomic chair backrests and vehicle steering columns.
- Verify locking capacity in Newtons before installation.
- Ensure the gas spring force calculator data accounts for the added locking weight.
How Do I Select the Correct Locking Force?
Select locking gas springs by calculating the total static load and ensuring the locking mechanism exceeds the maximum force applied to the rod.
What Is the Importance of Static Load Capacity?
Static load capacity is the maximum force a locked gas spring can withstand before the internal locking mechanism slips or fails completely.
Calculating the total load is only the first step. You must confirm that the locking mechanism is rated for the maximum static weight the application will exert. If you exceed the locking capacity, the internal valve may experience “creep,” where the rod slowly drifts despite the lock being engaged.
How Does Mounting Orientation Affect Locking Performance?
Locking gas springs perform most reliably when mounted with the rod pointing downward to ensure consistent oil contact with the seal.
Orientation influences not just the damping quality but also the wear patterns on the valve seat. For most industrial locking struts, the manufacturer specifies a rod-down orientation to maintain constant lubrication of the internal seal. Failure to adhere to the recommended orientation can result in premature seal failure or valve blockage.
How Does Temperature Affect Locking Gas Spring Performance?
Temperature extremes change the internal nitrogen pressure and seal elasticity, which can increase or decrease locking force and cause drift.
In cold environments, the gas pressure drops, reducing the available locking force; if the spring is sized for room‑temperature loads, it may creep under load. In hot conditions, pressure rises, potentially exceeding the lock’s rated capacity and accelerating seal wear, so manufacturers provide derating curves for both low and high temperature limits.
Seal materials (e.g., nitrile vs. fluorocarbon) are chosen to retain flexibility across the expected temperature range, and some locking springs include a temperature‑compensated valve to maintain consistent locking performance.
| Feature | Rigid Lock | Elastic Lock |
|---|---|---|
| Position Accuracy | High (Zero travel) | Moderate (Minor deflection) |
| Shock Resistance | Low | High |
| Typical Application | Precision platforms | Ergonomic furniture |
Frequently Asked Questions About Locking Gas Springs
Can I recharge a locking gas spring after it loses force?
No, gas springs are factory-sealed units that cannot be recharged in the field; once pressure is lost, the entire strut must be replaced.
Why does my locking strut drift when fully loaded?
Drifting indicates either an overloaded locking mechanism or an internal valve seat that has been contaminated by debris or wear over time.
How do I actuate the locking mechanism remotely?
Remote actuation is achieved using a bowden cable or hydraulic system attached to the release pin, allowing for operation away from the strut.
Are locking springs compatible with standard end fittings?
Yes, most locking gas springs use industry-standard gas strut end fittings like ball sockets and clevis brackets.
When maintaining your equipment, ensure you check the release pin for signs of oxidation or stiffness. If you are replacing older units, ensure you read our guide on how to measure a gas strut to ensure the replacement fits your existing mounting brackets. For custom industrial requirements, consult our team to discuss bespoke load ratings.
