Tapping Valve Assembly

Product Specifications

Technical details and manufacturing context for Tapping Valve Assembly

Definition

The Tapping Valve Assembly is a critical component within the Tapping/Tilting Mechanism that regulates the precise delivery of cutting fluid or lubricant to the tap during threading operations. It ensures proper cooling, lubrication, and chip evacuation to maintain thread quality, extend tool life, and prevent workpiece damage in automated machining systems. The assembly is designed for integration into CNC machining centers, transfer lines, and other automated equipment where tapping operations require synchronized fluid delivery. It is available in nominal sizes DN15 to DN50 (ISO 6708) and operates at pressures from 1.0 to 1.6 MPa. The flow coefficient ranges from 2.5 to 8.0 Cv, and the leakage rate at 1.1 times rated pressure is ≤0.01 mL/min (ISO 5208). Operating temperature range is -20°C to 80°C, with response times of 0.1 to 0.5 seconds for pneumatic actuation. Actuation pressure for pneumatic pilot is 0.4 to 0.8 MPa (ISO 6358). Body materials include stainless steel 304/316L (ASTM A276) and brass, with seals made of FKM or PTFE (ASTM D2000). The assembly weighs between 1.5 and 4.0 kg, depending on size and actuation type. For solenoid pilot versions, the supply voltage is 24 V DC ±10% (IEC 60038), and the ingress protection rating is IP65 (IEC 60529). These specifications are directory reference ranges and must be verified with the legal manufacturer for the specific model and application. The assembly is a component, not a standalone product, and its performance depends on proper integration with the tapping system. Always confirm model-specific values and standards with the supplier before procurement.

Working Principle

The assembly operates through hydraulic or pneumatic actuation, opening and closing in synchronization with the tapping cycle. When the tap engages the workpiece, the valve opens to deliver fluid through internal channels to the cutting zone. During retraction, the valve closes to conserve fluid and prevent contamination. The actuation signal is typically provided by the machine control system, ensuring precise timing. The valve's internal design ensures minimal pressure drop and consistent flow, contributing to effective cooling and lubrication. The response time of 0.1 to 0.5 seconds allows for rapid cycling in high-speed tapping operations. The valve's sealing mechanism prevents leakage, maintaining system integrity. Proper actuation pressure is essential for reliable operation; insufficient pressure may lead to incomplete valve movement. The assembly is designed for repeated cycling, with seals rated for the specified temperature range. Regular inspection of seals and internal channels is recommended to ensure optimal performance.

Common Materials

Stainless Steel, Brass, Engineering Plastics

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Size	DN15–DN50 mm	Matches pipe and tapping tool interfaceISO 6708
Operating Pressure	1.0–1.6 MPa	Below 1.0 MPa seat load is insufficient
Flow Coefficient	2.5–8.0 Cv	Determines coolant flow at given pressure drop
Leakage Rate	≤0.01 mL/min	At 1.1× rated pressure
Operating Temperature	-20–80 °C	Seals degrade above 80°C
Response Time	0.1–0.5 s	For pneumatic actuation
Actuation Pressure	0.4–0.8 MPa	For pneumatic pilotISO 6358
Body Material	304/316L ASTM	316L for corrosive coolantsASTM A276
Seal Material	FKM/PTFE	PTFE for high tempASTM D2000
Weight	1.5–4.0 kg	Depends on size and actuation
Ingress Protection	IP65	For solenoid enclosureIEC 60529
Supply Voltage	24 ±10% V DC	For solenoid pilotIEC 60038

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 containing fluid channels and mounting points

Material: Stainless Steel
Actuator
Mechanism that opens and closes the valve (pneumatic or hydraulic)

Material: Aluminum Alloy
Seals Part
Prevent fluid leakage at connection points

Material: Nitrile Rubber
Nozzle Adapter Part
Connects to fluid delivery lines

Material: Brass

Applied To / Applications

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

Tapping/Tilting Mechanism

View system integration details

Manufacturers of Tapping Valve Assembly

Manufacturer profiles associated with Tapping Valve Assembly.

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Frequently Asked Questions

What is the function of the Tapping Valve Assembly?

It controls the flow of cutting fluid or lubricant to the tap during tapping operations, ensuring proper cooling, lubrication, and chip evacuation to maintain thread quality and extend tool life.

What are the available nominal sizes and pressure ratings?

Nominal sizes range from DN15 to DN50 (ISO 6708), and operating pressure is 1.0 to 1.6 MPa. These are reference ranges; confirm exact values for your model.

What materials are used for the body and seals?

Body materials include stainless steel 304/316L (ASTM A276) and brass. Seal materials are FKM or PTFE (ASTM D2000). Material selection depends on coolant compatibility and temperature.

How is the valve actuated?

The valve can be hydraulically or pneumatically actuated. For pneumatic actuation, the actuation pressure is 0.4 to 0.8 MPa (ISO 6358), and response time is 0.1 to 0.5 seconds. Solenoid pilot versions require 24 V DC ±10% (IEC 60038).

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar (max 15 bar intermittent)
flow rate:	0.5 to 20 L/min
temperature:	-20°C to 120°C
slurry concentration:	Up to 5% solids by weight

Product Specifications

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