Out screw gate valve VS inside screw gate valve OS gate valve

Out screw gate valve VS inside screw gate valve

OS gate valve

Advantages of OS gate valve:

The fluid resistance is small, and the sealing surface is less washed and eroded by the medium. Less effort to open and close. The medium flow is not restricted, does not disturb the flow, does not reduce the pressure. The shape is simple, the structure length is short, the manufacturing process is good, the application range is wide.

Disadvantages of OS gate valve:

The sealing surface between easy to cause erosion and abrasion, maintenance is more difficult. The overall size is large, the opening needs a certain space, and the opening and closing time is long. The structure is more complex.

IS gate valve

Advantages of IS gate valve:

The height of the gate valve always remains the same, so the installation space is small, and it is suitable for gate valves with large calibers or limited installation space. The structure should be equipped with an opening and closing indicator to indicate the opening and closing degree.

Disadvantages of IS gate valve:

Valve stem threads not only can not be lubricated, but also directly accept the medium erosion, easy to damage.

OS VS IS

1, IS gate valve can not see the screw, and OS gate valve can see the screw.

2, the lifting screw of IS gate valve is only rotating and moving up and down, the exposed is only a rod, its nut is fixed on the ram, through the rotation of the screw to lift the ram, there is no visible door frame; The lifting screw of OS gate valve is exposed, the nut is close to the handwheel and is fixed (do not rotate or move axially), and the ram is lifted by rotating the screw. The screw and the ram only have relative rotating motion without relative axial displacement, and the appearance is a portal bracket.

3. The steering wheel and the valve stem are connected together when the IS gate valve is switched on and off. It is relatively immovable through the valve stem rotating at a fixed point to drive the valve disc to lift up and the brake to complete the opening and closing. The OS gate valve lifts or lowers the disc through a threaded drive between the stem and the steering wheel.