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Motor Operated Globe Valve

Motor Operated Globe Valve

The motor operated globe valve is an important valve device widely used in the industrial field. It is mainly composed of an electric actuator and a stop valve body. The electric actuator can accurately receive the control signal, convert it into mechanical power, drive the valve stem up and down, and thus control the opening and closing of the valve. In the open state, the medium can pass smoothly; when closed, the valve disc fits tightly against the valve seat, effectively preventing the flow of the medium.
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When the electric actuator receives the opening signal, the motor starts and drives the valve stem upward through the reducer. The valve stem is connected to the valve disc. As the valve stem rises, the valve disc gradually leaves the valve seat, allowing the valve to open and the medium to flow. At this time, the electric actuator will accurately control the rising height of the valve stem according to the requirements of the control signal, thereby adjusting the opening of the valve and realizing the control of the medium flow.

 

 

Motor Operated Globe Valve

●Valve core: stainless steel 06Cr19Ni10 (two-way), HPb59-1 (three-way)
●Valve stem seal: four-layer V-type and O-type combined nitrile rubber seal, polytetrafluoroethylene sealing sleeve
●Valve stem: stainless steel 06Cr19Ni10
●Valve body, valve cover material: HT250
●Nominal pressure (PN): 1.6MPa
●Working medium: water, fluid temperature 5~95℃
●Valve leakage: ≤0.03%KV
●Flange standard: GB/T 17241.6 PN16

DDF-S-H

 

Installation Instructions

 

IMG974343

 This series of valves is compatible with Honeywell Johnson actuators.
 The valve stem moves downwards in the direction of valve opening.
 Before installing the valve, ensure that the pipeline is clean and free of scale, metal flakes and other debris left during welding.
 The pipeline must be concentric when connected to the valve body and not subject to vibration. The water flow direction should be consistent with that marked on the valve body.
 When the actuator is installed vertically on the valve body, avoid installing the actuator under the valve and leave enough space for daily maintenance (such as disassembling the actuator).
 When maintaining the valve, the power supply must be cut off or isolated, and the water system should not be under pressure.

Main categories

 

 

 Straight-through stop valve: The flow direction of the fluid in the valve body is straight, the structure is simple, and the fluid resistance is relatively small. It is suitable for occasions where the fluid resistance is not high.


 Direct-flow stop valve: The flow channel of the valve body is in an oblique line with the main flow channel. The degree of damage to the flow state is smaller than that of a conventional stop valve, and the pressure loss through the valve is also correspondingly smaller. It is often used in systems with high pressure loss requirements.


 Angle stop valve: The fluid only needs to change direction once, and the pressure drop through this valve is smaller than that of a conventional stop valve. It is suitable for occasions where the installation space is limited or the pipeline resistance needs to be reduced.

 

 

FAQ

 

1. How to achieve precise connection between the electric actuator and the valve body of the motor operated globe valve?
The connection between the electric actuator and the valve body is usually direct connection. During the installation process, it is necessary to ensure that the mechanical dimensions of the connection parts are accurately matched and firmly connected through fasteners such as bolts. At the same time, the coaxiality of the output shaft of the electric actuator and the valve stem must be ensured to achieve precise power transmission and ensure that the valve disc can accurately open and close.

 

2. What are the special requirements for the sealing surface material of the electric stop valve?
For ordinary working conditions, the sealing surface material needs to have a certain hardness and wear resistance, such as stainless steel, to ensure the stability of the sealing performance during long-term use. Under high temperature conditions, the sealing surface material needs to have high temperature resistance. Materials such as tungsten-chromium-cobalt alloy can be used in high temperature environments; in corrosive media environments, the sealing surface material must have good corrosion resistance. Materials such as polytetrafluoroethylene are often used in highly corrosive media.

 

3. How to ensure the normal operation of the motor operated globe valve in an extremely low temperature environment?
In an extremely low temperature environment, the valve body, valve stem and other components of the electric stop valve need to be made of materials suitable for low temperature environments such as low temperature steel to prevent the material from becoming brittle at low temperatures. At the same time, the electric actuator needs to be able to work in a low temperature environment, and its internal electrical components, lubricating oil, etc. need to adapt to low temperature conditions to ensure that the electric actuator can drive the valve stem to move normally at extremely low temperatures.

 

 

 

 

 

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