Injection Valve for Chemical Dosing Units

Product Specifications

Technical details and manufacturing context for Injection Valve

Definition

The Injection Valve is a critical component of a Chemical Dosing Unit, responsible for the precise metering and controlled release of liquid or gaseous chemicals into a main process flow. It ensures accurate dosing rates, prevents backflow, and maintains system integrity by isolating the chemical supply from the process line when not in use. The valve is designed for chemical manufacturing applications where reliable and repeatable injection is essential. It is available in nominal diameters from DN15 to DN50 (ISO 6708) and operates within a pressure range of 1.0 to 1.6 MPa. The flow coefficient (Cv) ranges from 0.5 to 2.5, determining flow capacity at a given pressure drop. The leakage rate is ≤0.01% of rated flow, meeting Class VI seat leakage requirements for tight shut-off. Operating temperature range is -20 to 150°C, limited by seal material; PTFE is used for higher temperatures. The valve responds within ≤100 ms for precise dosing control. It accepts a 4-20 mA control signal (IEC 60381) and requires a 24 V DC ±10% supply voltage for solenoid pilot or positioner. Electrical protection is IP65 (IEC 60529). Body material is stainless steel 316L (ASTM A182), and seal material is PTFE (ASTM D4894). Weight ranges from 2.5 to 8 kg depending on size and actuator configuration. The valve is suitable for corrosive chemicals due to its corrosion-resistant materials. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The valve operates by opening a flow path from the chemical reservoir to the process line upon receiving a control signal (pneumatic, electric, or manual). It typically uses a plunger, diaphragm, or needle mechanism to create a seal. When actuated, the seal retracts, allowing a precise volume of chemical to be injected. The closing action cuts off flow completely, ensuring no leakage or unintended dosing. The valve's response time is ≤100 ms, enabling rapid and accurate dosing cycles. The control signal (4-20 mA) modulates the valve position to achieve the desired flow rate. The valve is designed to maintain a tight seal under operating pressures up to 1.6 MPa, preventing backflow and ensuring process integrity.

Common Materials

Stainless Steel (e.g., 316L), PTFE (Polytetrafluoroethylene), Ceramic

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN15–DN50 mm	Standard pipe sizes for process connections.ISO 6708
Operating Pressure	1.0–1.6 MPa	Below 1.0 MPa the seat load is insufficient.
Flow Coefficient	0.5–2.5 Cv	Determines flow capacity at given pressure drop.
Leakage Rate	≤0.01 % of rated flow	Class VI seat leakage for tight shut-off.ISO 5208
Operating Temperature	-20–150 °C	Seal material limits range; PTFE for higher temps.
Response Time	≤100 ms	Full stroke time for precise dosing control.
Control Signal	4–20 mA	Analog signal for valve positioner.IEC 60381
Supply Voltage	24 ±10% V DC	For solenoid pilot or positioner.
Electrical Protection	IP65	Dust-tight and protected against water jets.IEC 60529
Body Material	316L SS	Corrosion-resistant for chemical service.ASTM A182
Seal Material	PTFE	Chemical compatibility and low friction.ASTM D4894
Weight	2.5–8 kg	Depends on size and actuator configuration.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body
Main housing that contains internal components and provides connection ports to the chemical line and process line.

Material: Stainless Steel
Actuator (Solenoid/Pneumatic)
Converts an electrical or pneumatic signal into mechanical force to open or close the valve.

Material: Aluminum Alloy / Plastic
Seal / Diaphragm Part
Creates a leak-proof barrier between the chemical chamber and the actuator or atmosphere, preventing contamination and ensuring precise shut-off.

Material: PTFE / EPDM / Viton
Orifice / Nozzle
Precision-engineered opening that determines the flow characteristics and droplet size of the injected chemical.

Material: Stainless Steel / Ceramic
Plunger or Needle
The moving element the actuator drives onto the orifice to shut the injection off.

Material: Stainless Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Chemical Dosing Unit

View system integration details

Manufacturers of Injection Valve

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Frequently Asked Questions

What is the operating pressure range of the Injection Valve?

The operating pressure range is 1.0 to 1.6 MPa. Always verify the exact pressure rating for your specific model with the manufacturer.

What materials are used for the valve body and seal?

The body is made of stainless steel 316L (ASTM A182), and the seal is PTFE (ASTM D4894). These materials provide corrosion resistance and chemical compatibility. Confirm material suitability for your specific chemicals with the supplier.

What is the leakage rate of the valve?

The leakage rate is ≤0.01% of rated flow, meeting Class VI seat leakage requirements. This ensures tight shut-off and prevents unintended dosing. Verify the leakage class for your application.

What control signal does the valve accept?

The valve accepts a 4-20 mA analog control signal (IEC 60381) for positioner or solenoid pilot. It requires a 24 V DC ±10% supply voltage. Check compatibility with your control system.

Data Basis

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pressure:	0 to 25 bar (max operating pressure)
flow rate:	0.1 to 100 L/min (depending on valve size)
temperature:	-20°C to 150°C
slurry concentration:	Up to 20% solids by weight (for standard models)

Injection Valve

Product Specifications

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