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Electric Single-Seat Regulating Valve

Core Structure

• Electric Actuator: Servo motor + reduction gear + position feedback, converting electrical signals into linear thrust, with manual operation.

• Valve Body Assembly:

◦ Single valve core + single valve seat (single seat structure)

◦ Valve stem, valve cover, packing seal

◦ Straight-through flow path, moderate flow resistance

Working Principle
1. Control system (DCS/PLC) outputs a 4~20mA signal.
2. The actuator receives the signal and drives the valve stem to raise and lower the valve core.
3. Changing the flow area between the valve core and the valve seat adjusts the medium flow rate.
4. Position feedback forms a closed loop, ensuring the opening degree is consistent with the signal.

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Product Description

Key Features

• Excellent Sealing: Single-seat seal, leakage rating up to ANSI IV/V/VI (soft seal can achieve zero leakage)

• High Adjustment Accuracy: Control accuracy ±0.5%, adjustable ratio R=50

• Good Flow Characteristics: Linear, equal percentage, quick-opening options available

• Simple Installation: No air source required, just connect to electricity and a signal line

• Compact structure, easy maintenance

Technical Parameters (Common)

• Nominal Diameter: DN15~DN200

• Pressure Rating: PN16/25/40/64, Class150/300

• Control Signal: 4~20mA DC, 0~10V DC

• Power Supply: AC220V/380V, DC24V

• Flow Characteristics: Linear, equal percentage

• Leakage Rating: IV/V/VI

Applications

• Chemical, petroleum, metallurgy, power, pharmaceutical, water treatment

• Steam, hot water, oil, corrosive media

• High-precision adjustment + strict sealing scenarios

• Small and medium diameter, medium and low pressure differential conditions

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Related Products

Angle Control Valve

Structural Features

• Right-angle valve body with 90° inlet and outlet, ensuring simple and smooth media flow.

• Valve core structure: Single-seat plunger type valve core, providing high adjustment accuracy.

• Flow path: Straight-through with low resistance, less prone to clogging and material accumulation.

• Internal components: Valve core and seat can be hardened for wear resistance and erosion resistance.

• Actuator: Commonly pneumatic diaphragm type, but electric actuators are also available.

Working Principle
Fluid flows in from the bottom, and the valve core moves up and down to change the flow area, achieving flow and pressure regulation.

Because the flow path has a right-angle turn, the media directly scours the bottom of the valve core, minimizing erosion on the valve seat and ensuring good stability.

Pneumatic Diaphragm Regulating Valve

Valve Body Structure (Two Main Parts)

1. Upper Part: Pneumatic Diaphragm Actuator (Diaphragm Head)

• Diaphragm: Rubber/Fluororubber, generates thrust under pressure

• Spring: Resets and balances air pressure (multi-spring structure is more compact)

• Push Rod: Connects the diaphragm and valve stem, transmits linear motion

• Bracket: Connects the valve body

2. Lower Part: Valve Body Adjustment Mechanism

• Valve Body: WCB, 304, 316, etc.

• Valve Core/Seat: Controls the flow area

• Valve Stem/Packaging: Seals against leakage

• Common Valve Body Types:

◦ Single-seat valve: Low leakage, high precision

◦ Double-seat valve: Low unbalanced force, suitable for large pressure differentials

◦ Sleeve valve: Stable, noise-reducing, erosion-resistant

◦ Angle valve: Anti-clogging, suitable for slurries and crystallizing media

Pneumatic Fluoropolymer-Lined Control Valve

Structural Components

• Pneumatic Actuator: Primarily multi-spring diaphragm type, receiving 4–20mA/pneumatic signals to drive the valve stem up and down.

• Fluorine-lined Valve Body: Carbon steel/stainless steel base, fully lined with fluoroplastic (PTFE/F4, FEP/F46, PFA) inner cavity.

• Valve Core/Seat: Metal core encased in fluoroplastic or integral fluoroplastic, soft seal, low leakage.

• Valve Stem: 316L/Hastelloy alloy, surface hardened, corrosion-resistant and wear-resistant.

• Seal: PTFE bellows + V-type PTFE packing, double protection against external leakage.

Nitrogen Blanketing Unit Control Valve

Core Components and Division of Functions

• Nitrogen Supply Valve: Opens when the tank pressure is lower than the set value, supplying nitrogen to the tank and maintaining a slight positive pressure.

• Nitrogen Relief Valve: Opens when the tank pressure is higher than the set value, releasing excess nitrogen to prevent overpressure.

• Breather Valve: Acts as a safety backup, providing overpressure/negative pressure protection in case of nitrogen sealing valve malfunction.

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