COVNA Products

COVNA WCB Flanged Type Globe Valve

COVNA WCB Flanged Type Globe Valve

COVNA flanged globe valves are used for 2-position or modulating control of steam, hot water, or chilled water-glycol solutions up to 50 percent concentration in heating, ventilation and air conditioning (HVAC) systems.It can be used in Feed-water, chemical, air, lube oil and almost all services where pressure drop is not an issue. Body material support WCB, CF8,CF8M etc.

  • Model: Globe Valve
  • Size Range: 1/2″ to 8″
  • Pressure Range: 1.6MPa
  • Material: WCB, Stainless Steel

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COVNA WCB  CF8M Flange Type Globe Valve

  • Better shut off as compared to gate valve;
  • Good for frequent operation as no fear of wear of seat and disk;
  • Easy to repair, as seat and disk can be accessed from the valve top;
  • Fast operation compares to gate valve due to shorter stroke length;
  • Usually operated by an automatic actuator;
  • Manufacture & Design Standard: GB、DIN、ANSI etc.

 

 – DESCRIPTION –

Globe Valve are used in the systems where flow control is required and leak tightness is also important. It used in high-point vents and low-point drains when leak tightness and safety are major concerns. Otherwise, you can use a gate valve for drain and vent. It can be used in Feed-water, chemical, air, lube oil and almost all services where pressure drop is not an issue This valve is also used as an automatic control valve, but in that case, the stem of the valve is a smooth stem rather than threaded and is opened and closed by lifting action of an actuator assembly.

Globe Valve

1.Oil and Gas Industry

Pipeline Flow and Pressure Control: Used for flow and pressure control in natural gas and oil pipelines to ensure stability during transportation.
Gas and Liquid Distribution Systems: Regulates the flow of gases or liquids, ensuring precise control under various operating conditions.
Automation of Distribution Systems: Used in refineries and natural gas processing plants to automate fluid distribution and regulate the reaction processes.

2.Chemical and Petrochemical Industry

Reactor Pressure and Flow Control: Used in chemical reactors, storage tanks, and other equipment to control pressure and flow, ensuring stability in the chemical reaction process.
Flow/Pressure Regulation: Regulates the flow of liquids or gases in processes such as polymerization, refining, and distillation to ensure efficient production.
Steam Control: Regulates the flow and pressure of steam in steam generators and distribution systems.

3.Water and Wastewater Treatment

Water Flow Control: Regulates water flow and pressure in water supply and wastewater treatment systems to ensure normal operation.
Gas and Chemical Additions: Regulates the flow of chemicals or gases (such as chlorine or ammonia) added during the water treatment process.

4.HVAC (Heating, Ventilation, and Air Conditioning) Systems

Temperature Control and Airflow Regulation: Used in air conditioning systems to regulate the flow of cooling or heating fluids to maintain the desired temperature.
Pressure and Airflow Regulation: Adjusts the flow and pressure of air in ventilation, air conditioning, and humidification systems to ensure indoor comfort.

5.Food and Beverage Industry

Liquid Flow Control: Precisely controls the flow of liquids in processes such as brewing, dairy production, and beverage bottling.
Temperature and Pressure Regulation: Regulates temperature and pressure during heating, cooling, and sterilization to ensure product quality and safety.

6.Pharmaceutical Industry

Precision Flow Control: Regulates the flow of liquids and gases in pharmaceutical manufacturing processes to ensure precise control of process parameters.
Pressure Control: Adjusts pressure in cleaning and sterilization systems to ensure stable system operation.

7.HVAC Systems

Airflow and Temperature Control: Controls the flow and temperature of air to adjust environmental conditions, ensuring comfort and energy efficiency inside buildings.

8.Steel and Metallurgical Industry

Gas Flow Control: Precisely adjusts the flow of gases such as oxygen and nitrogen during smelting and heating processes to ensure stable furnace temperatures and chemical reactions.
Cooling Fluid Flow Regulation: Regulates the flow of cooling fluids in cooling systems to ensure temperature control of equipment.

9.Thermal and Power Industry

Steam and Water Flow and Pressure Control: Regulates the flow of steam and water in boiler systems, heat exchangers, and power plants to ensure efficient operation of thermal systems.

10.Mining Industry

Slurry Flow Regulation: Adjusts the flow and pressure of slurry during transportation and separation processes to ensure efficient extraction and processing of minerals.

The actuator on my automated valve operates, but the valve won’t turn. Why?

Most likely the valve stem or actuator coupling is broken.

The electric actuator limit switches or the pneumatic actuator position stops are not correctly adjusted.

Probably because there is no air pressure to the solenoid or dirt has jammed it. Also, debris might be trapped inside the valve. Or, the air pressure is not sufficient to operate the actuator. Remember: measure air pressure at the actuator, not at the compressor.

Maybe. First, be sure that the actuator torque output is sufficient to turn the valve reliably. Second, you will have to fabricate a custom mounting bracket and coupling to connect the actuator to the valve.

The valve will stop somewhere between full open and close. When power is reapplied to the original circuit, the actuator will complete the cycle.

To make the change just remove the actuator from the valve and turn it, or the valve stem, 90 degrees and remount the actuator.

Remove the actuator from the valve and check the valve stem. Most ball valves have stem flats at right angles to the flow when the valve is in the off position. On butterfly valves check the stem flow arrow marking.

Remove the actuator from the valve and check the valve stem. Most ball valves have stem flats at right angles to the flow when the valve is in the off position. On butterfly valves check the stem flow arrow marking.

Check the electric wiring schematic that came with the actuator for the correct hookup. Sometimes a copy is inside the actuator cover. If it is missing, don’t guess about the connections. Call the manufacturer for a schematic.

The actuator is wired incorrectly (check the schematic accompanying the actuator), or the external control switch is not the correct type for the actuator.

Not unless you bought it with an optional speed control.

Actuators and solenoid valves require different types of electrical control switches. SPDT for actuators, SPST for solenoids. Check the actuator wiring schematic for the correct wiring and switch type.

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