Flanged Pneumatic Fluoropolymer-Lined Control Valve With Smart Positioner Anti-Corrosion Chemical Acid Alkali Regulating Valve Factory supply-Wenzhou Keton Valve Co., Ltd.

Three-Way Regulating Valve

Basic Structure and Types

Based on valve core structure, there are two main types:

1. Confluence Type Three-Way Valve (Two Inlets, One Outlet)

• Two inlets, one outlet

• Mixes two different temperatures/mediums before outputting

• Mostly used for temperature control of hot and cold fluids

2. Diverter Type Three-Way Valve (One Inlet, Two Outlets)

• One inlet, two outlets

• Diverts one flow path proportionally to two pipelines

• Mostly used for bypass regulation and flow distribution

Common Actuators:
• Pneumatic Diaphragm Type (Most Common)

• Electric Actuator (Electric Three-Way Control Valve)

• Can be equipped with a positioner to achieve 4–20mA automatic adjustment

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.

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.

Pneumatic Fluoropolymer-Lined Control Valve

Product Description

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Related Products

Three-Way Regulating Valve

Electric Single-Seat Regulating Valve

Pneumatic Diaphragm Regulating Valve

Pneumatic Fluoropolymer-Lined Control Valve