Entries by Perfect Manufacturing

What’s mud valve?

Mud valve is a type of angel- globe valve controlled by a hydraulic actuator, used in sedimentation tank bottom for city water or sewage treatment plant sludge and wastewater discharge. The medium for mud valve is primary sewage less than 50℃ and its working depth is less than 10 meters. The mud valve is for […]

What’s spring return ball valve?

Spring return valve refers to the valve that can return to the original starting position under the action of internal spring. It is suitable for 1/4 rotary handle operation of the ball valve, is generally composed of two/three pieces of the ball valve and a spring lever or handles unit to return the valve to […]

The commonly used material for valve body

Meets the preceding text, the common material of valve body includes carbon steel, low-temperature carbon steel, alloy steel, Austenitic stainless steel, cast copper-alloy titanium alloy, aluminum alloy, etc., of which carbon steel is the most widely used body material. Today here we will collect the commonly used material for valve body. Valve body material Standards […]

Control valve seat leakage class

In past articles, we introduce “What caused the leakage of valve” and “The leak rates standards of the industrial valve”, today here we will continue to discuss the valve leakage class and classification. ANSI FCI 70-2 is an industry standard for control valve seat leakage, specified six leakage classes (Class I, II, III, IV, V, […]

What caused the leakage of valve?

Valves are one of the main leakage sources in the pipeline system of the petrochemical industry, so it’s critical to the leakage of valves. Valve leakage rates are actually the valve sealing level, valve sealing performance is referred to as the valve sealing parts to prevent the ability of media leakage. The main sealing parts […]

How to prevent valve cavitation?

The disc and seat and other parts of the internal of the control valve and the reducing valve will appear friction, groove and other defects, most of these are caused by cavitation. Cavitation is the whole process of bubble accumulation, movement, division and elimination. When the liquid passes through the valve partially open, the static […]