How to pressurize a check valve! ! ! ! ! Urgent!

Adjust the direction and apply pressure (apply pressure together with the pipeline).

Is the check valve pressurized in the reverse direction? Imagine, let’s learn together!*

Of course, it should be pressed in the opposite direction; otherwise, it’s not possible to apply pressure in the direction of the flow. Also, check whether it opens smoothly

I’d like to share some insights… Please feel free to give me your advice! 1. Pressure testing: This includes testing the gas pressure and water pressure. (For different pressure standards, testing is carried out according to those standards; for example, for PN16, the gas pressure is 6–8 KG, while the water pressure is 22 KG.) It also involves testing the valve seat and the valve body. (The valve seat refers to the sealing surface, while the valve body refers to the entire structure of the valve.) The quality of the sealing performance is determined by the valve seat. Testing the valve body generally aims to detect leaks caused by casting defects. 2. Valve seat testing: For lift-type check valves, the fluid is directed in the opposite direction to test the sealing performance. Standard pressure is applied, and then the sealing condition on the other side is checked. Generally, if there is no leakage after 60 seconds, it means the valve meets the requirements. Valve body testing: Both ends of the valve are sealed, and pressure is applied throughout the valve cavity to check for leaks on the outside of the valve body. If there is no leakage after 60 seconds, it means the valve is satisfactory. Please use this information as a reference and share your thoughts with others. There are a few reference images available, but I’m unable to post them here.:L

This is my first time here. I’m not very good at posting yet and am trying hard to learn*~:handshake

When applying pressure, make sure the direction of water flow is not opposite to that of the check valve; alternatively, reverse the orientation of the check valve. After testing under pressure, just remember not to change the orientation of the check valve back to its original position.

I work in the sales of imported valves. Check valves generally need to undergo hydrostatic testing and seat leakage testing. Hydrostatic testing is a test to determine the strength of the valve body, and it is usually carried out before installation. The test is simple: it is conducted at 1.5 times the design pressure, with the duration determined by standards; imported valves typically follow ANSI B16.34 for these purposes. I won’t go into further details on that. Another test is the seat leakage test, and for check valves, pressure is applied in the reverse direction, as there is always a specific direction in which the fluid should flow, whether the valve is lift-type or swing-type. It’s important to pay attention to the pressure used in this test, as many people get confused regarding this aspect. Many people say that the pressure for the leakage test should be set at 1.15 times the design pressure, but this is definitely incorrect; I won’t go into further detail as it’s already off-topic.

Before installation, a check valve can be pressurized with pressure applied to both the inlet and outlet; after installation, pressure can only be applied in the reverse direction.

I’m really curious too; I hope the seniors can give me some guidance

When testing a check valve for pressure, the test must be carried out in reverse order to detect leaks, as check valves are primarily designed to prevent backflow.