High Pressure Globe Valve

What is a high pressure globe valve?

The high-pressure globe valve is small in size, but the structure is not simple. The high-pressure globe valve is usually used in places where the temperature is high, so it can withstand high temperature. Relatively speaking, the high-pressure globe valve has many advantages, which are unmatched by other valves, and its working environment is special, which cannot be replaced by other valves.

The opening and closing part of the high temperature and high pressure globe valve is a plug-shaped valve disc, the sealing surface is a plane or a conical surface, and the valve disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem rises and falls, and the handwheel does not rise and fall), and there is also a lifting rotating rod type (the handwheel rotates and lifts together with the valve rod, and the nut is arranged on the valve body). The globe valve is only suitable for fully open and fully closed, no adjustment and throttling are allowed.

Working principle

The high-pressure globe valve is a forced-sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to not leak. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur. In recent years, since the emergence of self-sealing valves, the medium flow direction of the globe valve has been changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the valve stem's force is small. The diameter can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter.

Features of high temperature

1. The middle cavity of the valve adopts a pressure self-tightening sealing structure, and the sealing performance is better.

2. The sealing surface of the valve disc and valve seat is made of Stellite cobalt-based cemented carbide by spray welding, which has good wear resistance, high temperature resistance, corrosion resistance and scratch resistance.

3. High temperature creep resistance design.

4. The valve stem adopts an integral forging structure, which is quenched and tempered and surface nitrided, and has good corrosion resistance and scratch resistance.

5. The depth of the bonnet stuffing box is reasonable, the packing is added with corrosion inhibitor, and the sealing is reliable.

Specifications of high temperature

Materials:C-Steel, Mo-Steel, CrMo Steel, CrNiMo Austenistic Stainless Steel , Ni Alloys, Duplex, Super Duplex

Connections: Flanged, Buttweld Ends, Specials

Bonnet: Bolted, welded, Pressure sealed, Bonnetless design

Applicable temperature: up to 670°C (standard is Stellite ring, titanium rod or others);

Application medium: acid, liquid, water, steam and other non-toxic and non-corrosive liquid and gaseous media, engine fuel.

Drive mode: hand wheel, pneumatic, electric;

Advantages

Simple structure, easy to manufacture and maintain.

Small work schedules and short switching times.

Good sealing performance, small friction between sealing surfaces, and long service life.

Disadvantages

The fluid resistance is large, and the force required for opening and closing is large.

Not suitable for media with particles, high viscosity and easy bonding.

Poor regulation performance.

What are the items that should be checked regularly after the high pressure globe valve is installed?

1. The wear of the sealing surface of the globe valve.

2. The wear of the trapezoidal thread of the stem and stem nut.

3. Whether the packing is outdated and invalid, if it is damaged, it should be replaced in time.

4. After the globe valve is repaired and assembled, the sealing performance test should be carried out.

Different names for globe valve:

According to the application: electric steam control valve, power station globe valve, pneumatic steam control valve, steam actuator valve, steam control valves with pneumatic actuators, etc.

According to the diameter: 25mm globe valve, globe valve 12 inch, DN32 globe valve, etc.

Summarize

There are many different names for the same valve, we can make almost all types of globe valves, so if you need a globe valve, you can directly contact us to help you choose the type instead of looking for it by the product name, which can save money You have a lot of time and look forward to your contact.

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