This is a duckbill check valve. It’s used in hydraulic and pneumatic systems. It’s a critical part of Check and Non-Return Valves and One-Way Flow Valves for controlling fluids.It’s a specialized kind of Reverse Prevention Valves. It has a regular 3D structure. The middle part of it looks like a cavity. Inside, there’s a duckbill-shaped valve flap—this is the core part that lets fluid flow in only one direction. When fluid flows forward, the valve flap opens up. When fluid tries to flow backward, the valve flap shuts tight.Flat wing structures stick out from both sides of the valve. The surfaces of these wings have small dotted protrusions. The wings make it easy to handle and fix the valve when installing it. For example, you can use tools to clamp the wings, or hold them by hand to put the valve together or take it apart. The dotted protrusions make the wing surfaces more rough. This stops the check valve from sliding around when you’re installing it, so it fits accurately and stays secure. Its design meets the functional precision needs of Directional Control Valves and Fluid Check Mechanisms in hydraulic and pneumatic systems.
Product Features
1. Functions
1)Preventing Fluid Backflow:In hydraulic and pneumatic systems, the duckbill check valve makes sure fluid (like hydraulic oil or compressed air) only flows in one direction. When fluid flows forward, its pressure pushes the duckbill valve flap open—this lets the fluid pass through smoothly. When fluid tries to flow backward, the duckbill valve flap shuts tight. It does this because of the reverse pressure and its own elasticity, which blocks the fluid from flowing back. For example, if you install this valve at the air source outlet of a pneumatic system, it stops compressed air from flowing back when the air source stops supplying air. This keeps the system’s pressure stable. This core function is the same as the key role of Check and Non-Return Valves and Reverse Prevention Valves in keeping fluid systems safe.
2)Protecting System Components:It stops system equipment (like pumps and compressors) from getting damaged by fluid backflow. For instance, if you install a duckbill check valve at the outlet of a hydraulic pump—this pump works with systems that use Sealed Hydraulic Pumps or Micro Sealed Hydraulic Pumps—it blocks hydraulic oil from flowing back. This keeps the oil from hitting the pump body when the system’s pressure changes suddenly, which makes the equipment last longer. This protective effect helps meet the reliability needs of Sealed Diaphragm Pumps and Sealed Fluid Transfer Pumps in high-pressure environments.
3)Assisting Stable System Operation:It helps keep the pressure in the system balanced and stable—this is especially useful for systems that are sensitive to pressure changes. For example, in a hydraulic system with multiple parallel actuators, the check valve stops pressure changes (caused by one actuator working) from affecting other actuators. This makes sure all components work normally. This stabilizing role helps Sealed Fluid Direction Control Valves and Mini Sealed Valves keep working steadily in complex fluid circuits.
2. Required Characteristics
1)Excellent Sealing Performance:The duckbill valve flap and the valve seat must seal really well. Under reverse pressure, they need to block fluid completely—no leakage at all. This makes sure the system is reliable and stable. Even a tiny bit of leakage can make the system’s pressure drop, which messes up the normal work of actuators. This sealing standard meets the strict leak-proof needs of Mini Sealed Valves and Sealed Fluid Direction Control Valves.
2)High Elasticity and Flexibility:The duckbill valve flap needs to be elastic and flexible. This lets it open and close easily when pushed by fluid pressure. It also stops the valve flap from getting damaged after moving back and forth many times over a long time. And it can bounce back to its original shape quickly—this keeps the check valve working normally. This mechanical property is like the elastic needs of sealing parts in Sealed Diaphragm Pumps and Sealed Fluid Transfer Pumps.
3)Corrosion Resistance:Hydraulic oil might have additives in it. Compressed air in pneumatic systems might have moisture and small impurities. So the material of the duckbill check valve must be able to resist corrosion. It shouldn’t get corroded by the fluid it’s moving—this makes sure the check valve lasts long and works well. This resistance meets the material durability standards of Fluid Check Mechanisms and Directional Control Valves in harsh fluid environments.
4)Sufficient Mechanical Strength:It must be strong enough to stand the fluid’s pressure and the impact of fluid flow in the system. Even under high pressure or when fluid hits it many times quickly, it won’t crack or change shape—no such problems will happen. This makes sure it works stably no matter what the working conditions are. This structural strength matches the mechanical stability needs of Micro Sealed Hydraulic Pumps and Sealed Fluid Transfer Pumps for their supporting parts.
