Flange Gate valve

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Technical Date		Material Specification
Nominal Diameter	DN50-DN600	Valve Body	Ductile Iron QT450-10
Nominal Pressure	PN10/PN16	Hand Wheel
Operation Temperature	-40°C~225°C	Bonnet
Flange Driling Standard	EN 1002-2 PN10/16	Gland Flange
Suface Treatment	Akzo Nobel Fusion Bonded Epoxy	Stem	2Cr13/ss410
Suface Treatment	Akzo Nobel Fusion Bonded Epoxy	Seal Material	EPDM or NBR
Application	Portable water, water distribution service & feed lines, sewage disposol, irrigation, fire protection pipe systerm, etc.	Wedge Nut	Carbon Steel
Application		Thrust Washer	Brass

Q: Gate valve, butterfly valve, ball valve advantages and disadvantages? What are the usual valves?: Stop valve: a valve that closes the valve and moves along the center line of the valve seat. According to this form of valve movement, the valve seat opening change is proportional to the valve stroke. Because of the valve stem to open or close the trip is relatively short, but very reliable cut off function, and because changes in the valve seat and the valve stroke is proportional, is very suitable for flow regulation. Therefore, this type of valve is very cooperative for cutting or regulating and throttling.Advantages: in the process of opening and closing, because the friction between the valve and the sealing surface of the valve body is smaller than that of the gate valve, the utility model has the advantages of wear resistance. Second, the opening height is generally only 1/4 of the seat channel; therefore, it is much smaller than the gate valve; usually there is only one sealing surface on the valve body and the disc; therefore, the manufacturing process is better and the service is easy to maintain. Because its packing is generally a mixture of asbestos and graphite, it has a higher temperature resistance. Steam valves are normally used with stop valves.Disadvantages: as a result of the medium through the valve flow direction has changed, so the minimum flow resistance valve is higher than most other types of valves; second, due to longer travel, opening slower than the ball.

Q: greater than DN50 of the pipeline butterfly valve?: Have not heard of this requirement, before the ball valve and butterfly valve quality is rarely used now are good, can be used, but not easy to control the flow valve butterfly valve can close more time-saving, fluid resistance of small. HVAC branch pipe, to flow control, so the choice of gate valve and cut-off valve is more reasonable, and now choose a ball valve is also a lot.

Q: Analysis of the advantages of elastic seat sealing gate valve?: When the elastic seat sealing gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the flashboard is pressed to the valve seat of the other side only by the medium pressure to ensure the sealing of the sealing surface, which is self sealing.

Q: Why can't the pressure measuring point be set at the two ends of the gate valve when measuring the resistance loss of the gate valve?: Because of the unsteady flow of fluid near the inlet and outlet of the valve, the measured data cannot be obtained relatively accurately.

Q: Installation and operation instructions of knife gate valve: 1. knife gate valve installation, check the valve cavity and sealing surface and other parts, not allowed to dirt or sand adhesion;2. bolts of connecting parts must be tightened evenly;

Q: What's the difference between open rod gate and dark rod gate valve?: There are several differences between the open bar gate valve and the dark rod gate valve:1, the bright bar gate valve can see the screw rod, but the dark rod can not see the lead screw;2, clear shot valve is threaded through the drive rod and the steering wheel to raise or lower the valve; dark rod valve in the switch when the steering wheel is connected with the valve stem is relatively fixed, it is through the stem of a fixed point in the rotation to drive the valve to move up and down to complete the opening and closing of the;Drive screw

Q: What does gate valve do?: Gate valve structure, upstairs said about the same, but it can only rough adjustment flow, you may drive it to 30%, he will flow through 65% traffic, you can drive him to 70%, he also flow through 75% traffic. However, the fluctuation is small and can be used for rough adjustment of flow. What's more, half open and half closed are some of the effects on their life span.

Q: What is the allowable leakage rate of the gate valve D?: In GB/T 13927, the leakage rate of the valve is divided into 10 grades, namely: A, AA, B, C, CC, D, E, EE, F, G class. And stipulates that when the order contract does not specify, the metal sealing valve according to D requirements.

Q: What's the difference between a soft seal gate valve and a hard sealed gate valve?: The difference is that the form of the gate seal surface is different.General gate valves are generally leaking, easy to rust and other phenomena. Soft sealing gate valve (elastic seat sealing gate valve), gate material for cast iron lining rubber, overcome the shortcomings of the general gate valve, such as poor sealing, elastic fatigue, easy to rust, etc.. Soft sealing gate valve is a new product of the traditional gate valve.

Q: What is the difference between a flanged gate valve and a wire gate valve?: Flanged gate valves are flanged and must be welded to the flanges of the pipe, bolted together

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