stop valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When the medium from the disc below to the valve, the operating force to overcome resistance, is stem and packing friction with the thrust produced by medium pressure, close the valve force stronger than open the valve, so it's bigger, the diameter of the stem or stem top bending failure happens. In recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the valve cavity, in the medium pressure at this moment, close the Industrial Valves of the force is small, and the strength of the valve, the valve stem diameter can be correspondingly reduced

how to differentiate between cast steel valve and cast iron globe valve different five aspects:

surface brightness: dark grey cast iron surface, glossy surface of cast steel, gray iron and nodular cast iron in cast iron is different, the ball brighter than grey cast iron.

surface particles: the surface of the cast steel is very dense particles generally invisible to the naked eye. Grey iron and ductile iron particles can be seen, and grey iron particles.

voice: steel is the voice of the collision & other; Just & throughout; ? Do not agree with iron voice.

gas cutting: the steel surface is very rough,? Gate, the area of the riser are big, and be sure to gas cutting to clear, nodular cast iron with gas cutting is cut constantly.

resilience: cast steel toughness is close to steel, nodular cast iron and cast steel toughness compared it slightly, thin-walled to 20 30 degrees of bend, but grey cast is no toughness.

The use of resilient seal gate valve resilient wedge gate valve is a great trend in today's world. What you should know is that it has become a very important part of business today.
should only be created by the very best ductile iron gate valve companies with the training, experience and know how about what is expected of them.
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