Top-guided single-seat control valvesplease refer to attached specification

Single seated globe-type control valves are usually used for tight shut-off but low differential pressure applications. And double-seated control valves are used for large flow capacity and high differential pressure drop conditions. The double-seated control valve has large leakage, so it can’t be tight close very well.

(a) Single-Seated Globe Control Valve

(b) Double-Seated Globe Control Valve

The single-seat globe valve has a seat and a plug. In this type of valve, the actuator thrust will act on the valve plug up to the valve seat, and an upward force is generated during the fluid flow process. The actuator should resist this force to drive the valve fully close. If the valve size is large, more energy needs to be offset by a significant differential pressure drop. So, in general, the single-seated globe valve is not suitable for high-pressure conditions. But if it needs to be used in the tight shut-off function, it is necessary to use a single-seat valve to stabilize the movement and direction of the valve stem through a guide cage. It is essential to pay attention to differential pressure, flow rate, temperature for the appropriate actuator, and trim design during valve selection.

The double-seated control valve has two-seat and two plugs which design top and bottom guided. Due to process pressure acting upward in one plug and down in the other, the force is balanced.

1. Body 2. Seat Gasket 3. Seat 4. Plug 5. Top-Guided 6. Seal Gasket 7. Bonnet 8. Packing Spring 9. Packing 10. Packing Screw 11. Packing Flange 12. Screw 13. Nuts 14. Stem 15. locknut 16. Stem Connector 17. Actuator

1. Hexagon Bolts 2. Cover Cap 3. Winding Sealing Ring 4. Bottom Seat 5. Valve Body 6. Plug 7. Sealing Gasket 8. Top Seat 9. Valve Bonnet 10. Stud 11. Hexagon Nuts 12. Packing Spring 13. Packing Set 14. Packing Screw 15. Packing Gland 16. Screw 17. Nuts 18. Stem 19. Locking Nut 20. Indicator 21. Actuator

Single Seated Control Valve Manufacuturer

For Water, Oil, or Steam System pdf

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Model HTS Pneumatic Top-guided Single Seated Control Valves are designed for heavy-duty service. The compact valve body, having an S-shape flow passage that features low-pressure loss, allows a large flow capacity, rangeability, and high accuracy flow characteristics.

Easy operating and maintenance which can be used under various applications, especially under normal pressure and normal pressure drop. Valves of this type are the most economical and reliable. The compact valve, simple construction having low pressure loss, allows large flow capacity rangeability, and high accuracy flow characteristics. It is available with bellows seal, extension, fin, jacket bonnet. The flow shut-off performance complies with the JIS, ANSI standards. Standard combined actuators are multi-spring diaphragm actuator.

What is a top guide single seated control valve?

The single-seat globe valve has a seat and a plug. In this type of valve, the actuator thrust will act on the valve plug up to the valve seat, and an upward force is generated during the fluid flow process. The actuator should resist this force to drive the valve fully close.

What is a control valve and its specifications?

A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.

How do you specify control valves?

When selecting a control valve for process plant, there are many things to be considered. These can include the valve flow characteristic, size, valve body and trim materials, noise, potential for damage from cavitation or flashing, actuator type and size, dynamic response to changes in control signal etc.

What are the four parts of the FCE control valve?

There are four basic parts of a control valve: the Ball, the Seat, the Bonnet, and the Positioner. The purpose of the bonnet is to support the Plug and Seat while they are assembled. This part also protects the valve against leaks during assembly.