Introduction to Classification of One-way Ball Valves

General ball valves do not indicate the direction, can be installed at will. In theory, the ball valve has no direction, but in order to prevent the leakage between the valve body and the valve cover from being too large, the ball valve body is usually connected with the direction of the tank or material. Some ball valves have directionality and are generally marked on the ball valves, which fail to achieve good sealing.
There are two kinds of ball valves, one-way sealed ball valve and two-way sealed ball valve. The former has directionality, and the latter has no directionality if installed in reverse. There are two-way seals and one-way seals in structure: two-way seals generally have no flow direction requirement, one-way seals have flow direction requirement.
Manual ball valves have no direction, but control valves have direction. V-type ball valves and eccentric hemispherical valves are directional, generally marking medium flow direction in the valve body. Floating ball valves and fixed ball valves are bidirectional, while eccentric hemisphere valves, V-shaped ball valves and lifting stem track ball valves are unidirectional.
Ball valves are divided into O-type ball valves and V-type ball valves. O-type ball valve adopts floating structure, ball core is precision castings, hard chromium plating treatment on the surface, valve seat adopts reinforced PTFE material, runner mouth and pipeline diameter are the same, flow capacity is great, flow resistance is very small, no leakage when closing, generally used as switch valve, especially for high viscosity, containing fibers, granular media; V-type ball valve adopts fixed structure, with V-type notch on the ball core, which can realize proportional adjustment, and the flow characteristics are approximately equal percentage. The medium flows to the valve body.
As a user, O-type ball valves are generally used for switching, basically two-way sealing, so there is no directional requirement; V-type ball valves are used for control, generally one-way sealing, with directional requirements.
In actual use, the characteristics of each product may be different, just depending on whether there is flow direction indication on the valve body, if not, it is bidirectional seal, no installation direction requirements. If so, it is necessary to install the instruction installation to achieve good sealing effect.

One-way valve, also known as check valve or check valve. It is a device that the fluid can only flow along the intake, but the outlet medium can not flow back. One-way valves are straight-through and right-angle.
Used in hydraulic system to prevent reverse flow of oil flow, or in pneumatic system to prevent reverse flow of compressed air.

One-way valves are straight-through and right-angle. The straight-through one-way valve is installed on the pipeline by threaded connection. The right-angle one-way valve has threaded connection, plate connection and flange connection. Hydraulic control one-way valve, also known as locking valve or pressure retaining valve, is the same as one-way valve to prevent reverse flow of oil. But when the reverse flow of oil flow is needed in the hydraulic circuit, the oil pressure can be controlled and the one-way valve can be opened to make the oil flow flow in both directions. Hydraulic control one-way valve uses conical spool, so the sealing performance is good. This valve can be used as one-way locking to keep pressure when sealing oil pipeline is required. There are two ways to control oil leakage by hydraulic one-way valve: internal and external. Internal leakage type can be used in oil pipeline without back pressure at reverse outlet of oil flow; otherwise, it is necessary to use external leakage type to reduce control oil pressure.