API 6D Check Valve

‌RockySea Petro: A Pioneer in API 6D Check Valve Manufacturing in China

A valve that relies on the force of medium flow to open or close itself, in order to prevent medium backflow, is called a check valve. Check valves belong to the automatic valve category and are mainly used in pipelines with unidirectional flow of medium. They only allow medium to flow in one direction to prevent accidents.

RockySea has obtained API Q1, API 6D and ISO standards. RockySea has rich experience in manufacturing check valves and all products undergo 100% inspection before delivery.

Description

The function of a check valve of this type is to only allow the medium to flow in one direction and prevent flow in the opposite direction. Usually, this type of valve operates automatically, and under the pressure of fluid flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the valve seat is cut off by the fluid pressure and the self weight of the valve disc, which acts on the valve seat. 

Principle

Check valves include swing check valves and lift check valves. The swing check valve has a hinge mechanism and a valve disc that is like a door, freely leaning against the inclined valve seat surface. In order to ensure that the valve disc can reach the appropriate position on the valve seat surface every time, the valve disc is designed in a hinge mechanism, so that the valve disc has sufficient swing space and makes full contact with the valve seat.

The valve disc can be made entirely of metal, or it can be embedded with leather, rubber, or synthetic covering on the metal, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unobstructed, so the pressure drop through the valve is relatively small.

The disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except for the valve disc, which can be freely raised and lowered, the rest of the valve is like a globe valve. Fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the medium reflux causes the valve disc to fall back onto the valve seat, cutting off flow. According to the usage conditions, the valve disc can be an all metal structure, or it can be in the form of a rubber pad or rubber ring embedded on the valve disc holder. Like globe valves, the passage of fluid through lift check valves is also narrow, so the pressure drop through lift check valves is greater than that of swing check valves, and the flow rate of swing check valves is limited very little.

Type

According to structure, the check valve of RockySea can be divided into three types: lift check valve, swing check valve, and butterfly check valve.

1. Swing check valves are divided into three types: single disc, double disc, and multi disc.
2. Lift check valves are divided into two types: vertical and horizontal.
3. The butterfly check valve is a straight through type.

The above types of check valves can be divided into four types of connection forms: threaded connection, flange connection(RTJ,RF), welded connection(BW), and clamp connection.

Data sheet

Contact us

Any question about API 6D Check Valve  ( API 6D Check Valve price,API 6D Check Valve for sale) ,please email service@rspetro.com , you will get reply within 12 hours!