utorak, 23.05.2017.
Check Valve Quality Inspection Method
The quality of the product is important when the check valve is doing a lot of work. The normal operation of the check valve is the guarantee of the work continuity. In the leisure time, the check valve can be checked by various testing methods to achieve the purpose of safety work. So, how to detect check valve?
We usually divide the most simple detection method of the check valve into three steps:
First, open the check valve passage, water is filled with valve chamber, and step up to the strength test requirements pressure, check the valve body, valve cover, gasket, filler leakage.
Two, close the valve way, check valve side pressure to nominal pressure, check from the other side of the leakage.
Three, Turn the check valve upside down and test the opposite side. Through the above three simple steps, we can analyze whether the basic working state of the check valve is abnormal or not.
Of course, there are more complex testing methods, the following method is pointed out for more complex potential problems, and its steps can be basically divided into two steps:
One, check valve test pressure, nominal pressure is 0.4Mpa-32Mpa, these commonly used pressure valve, valve strength, test pressure is 1.5 times of its nominal pressure. Valve sealing test pressure is equal to 1.1 times of the nominal pressure.
Two, the check valve test bed usually has a pressing part on it. There is a pipeline connected with the pressure test pump below. After pressing the valve, the pressure pump works, from the pressure test pump pressure gauge, you can read the valve figures to bear the pressure. When the electric valve is pressurized, the air in the valve should be discharged. The upper platen of the test stand has an exhaust hole to open and close with a small valve. The sign of the clean air is that all the air out of the exhaust hole is water. After the vent is closed, start the boost. The boosting process should be slow, not sharp. After reaching the required pressure, keep for 3 minutes and the pressure remains the same.
For more information about sanitary valves, please visit http://www.adamantvalves.com/sanitary-check-valves.html
Oznake: check valve
- 08:44 -
Installations of Lift Check Valves
Product features of lift check valves
1, product is designed and manufactured according to GB12236 design standards, has reasonable structure, reliable sealing, beautiful appearance.
2, the valve seat sealing surface has Stellite surfacing cobalt based alloy, wear resistant and heat resistant, anti abrasion performance and long service life.
3, can use a variety of piping flange standards and flange sealing surface type, to meet the needs of various engineering and user requirements.
4, valve material range, packing and gaskets are in accordance with actual conditions or user requirements reasonable selection, can be applied to a variety of pressure, temperature and medium conditions.
5, Disc rotated around the valve seat outside the pin, reduce the sharp impact when closing.
6, Pin shaft and valve connection, the use of built-in pin structure, reducing leakage points, the use of more reliable.
Method for mounting lifting check valve
1, the valve lift check valve of the disc valve seat is rotated around the channel axis, because the valve channel into a streamlined, flow resistance than the small rise butterfly valve, suitable for large caliber occasions in low flow and no flow frequently changes, but not for the pulsating flow, the sealing the performance is less than lift. Butterfly check valve is divided into single, double flap and most of the three kinds, these three forms are mainly divided into the valve bore, the purpose is to prevent the media to stop flow or reverse flow, reduce hydraulic impact.
2, lift check valve: disc along the valve vertical centerline of the check valve, the internal thread check valve can only be installed on the horizontal pipe, in the high pressure small caliber check valve, the valve can be ball. Butterfly check valve body shape is the same as the cut-off valve, so it has a larger coefficient of fluid resistance. The structure is similar to the cut-off valve, the valve body and the disc are the same as the cut-off valve. The lower part of the upper valve and the valve cover processing guide sleeve, the valve in the valve lift free guide simple light driven, when the medium downstream, the valve thrust open by the media, when the media stopped flow, the valve by the self vertical landing on the seat, preventing the media from the upstream effect.
3, lift check valve: disc is rotated around the valve seat in the pin of the check valve. The disc type check valve is simple in structure and can only be installed on the horizontal pipe. It has good sealing performance.
4. Lift check valves: Valves sliding is along the centerline of the valve. Pipe type check valve is a new kind of valve. It has small size, light weight and good processing technology. It is one of the developing directions of check valve. But the coefficient of fluid resistance is slightly larger than that of the swing check valve.
5, compression type check valve: This valve is used as boiler water supply and steam cutting valve, it has lift check valve and stop valve or angle valve comprehensive function.
For more information about sanitary valves, please visit http://www.adamantvalves.com/sanitary-check-valves.html
Oznake: check valve
- 08:15 -
