Bronze high-rod screw gate valve
Internal thread gate valve, also known as closure door, is the most widely used one of the valves, belongs to the forced sealing valve, its closure principle is, depending on the pressure of the valve bar, the disc sealing face and seat sealing face tight fit, to prevent the flow of media.It is divided into several categories in different ways.The internal thread gate valve has the characteristics of simple structure, good sealing life, large fluid resistance and poor regulating performance.
Internal thread gate valves, high pressure gate valves and corrugated globe valves belong to the type of forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak.When the medium from the lower valve disc into valve 6, the operating force to overcome the resistance, is the friction force of the valve stem and packing and the thrust generated by the pressure of the medium, the force of the valve is larger than the force of the valve open, so the diameter of the valve stem to be large, otherwise the valve stem bending fault will occur.From the appearance of the sealed valve, the flow of the globe valve media will be changed from the upper disc into the valve chamber, then under the action of media pressure, the force to close the valve is small, and the force to open the valve is large, the diameter of the valve stem can be reduced accordingly.At the same time, under the action of the medium, this form of the valve is more rigorous.China's valve "three to" has been stipulated that the flow of the globe valve, all adopt from top to bottom.
When the internal thread gate valve is opened, the opening height of the disc is 25% ~ 30% of the nominal diameter, and the flow rate has reached the maximum, indicating that the valve has reached the full open position.So the full open position of the globe valve should be determined by the stroke of the disc.
1.Simple structure, manufacture and maintenance more convenient.
2.Small working schedule, short opening and closing time.
3.Good sealing, small friction between sealing surface, long service life.
Packing & Delivery :
Packing Details :all by seaworthy plywood case and packed strongly by packing belt as below
Delivery Details :Generally it is 5-10 days if the goods are in stock. or 15-30 days if the goods are OEM or not enough subject to the order quantity. But anyway, normally, we are able to make sure the delivery will not exceed 45 days.
