---
title: "Pilot-Operated Check Valves"
space: "Knowledge"
url: "https://pravahihydraulics.com/knowledge/poc"
updated: "2026-02-27"
---

- **Description**: Allow fluid flow into an actuator but block reverse flow unless pilot pressure opens the valve.
- **Use Case**: Suitable for static load holding, such as outrigger cylinders in cranes or boom support in aerial platforms. They prevent drift from slow leaks or hose failures.
- **Why Use**: Simple, cost-effective, and reliable for static applications. Sun Hydraulics notes low leakage (less than 5 drops/minute) when rigidly mounted.
- **Example**: HydraForce VBSN-12U-RS or Sun Hydraulics CK** series for compact systems.