Name: TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC Needle Valve – Air-Operated Precision Flow Control Module - MASSIVE
SKU: TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC

TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC Needle Valve – Air-Operated Precision Flow Control Module

Brand ABB

Model TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC

The TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC is a precision air-operated needle valve engineered by TOHO KASEI CO LTD of Japan, a specialist manufacturer of pneumatic fluid-control components for high-purity and fine-metering applications. Falling within the AV series of air-operation valves, the 4F-AV-N20-N-CIFF-3-4-NC combines a needle-style throttling element with a normally closed (NC) pneumatic actuator, allowing process air or an external solenoid-piloted supply to open the valve only when commanded, and automatically returning it to the closed, leak-tight position on loss of signal or air pressure. This fail-safe behaviour makes the unit especially attractive where accidental over-dosing or uncontrolled discharge cannot be tolerated.

The model designation encodes its functional envelope: the “4F” prefix identifies the four-function valve family, “AV” denotes the air-operated valve series, “N20” indicates a DN20 (approximately 3/4-inch) nominal bore, “N” specifies the standard porting configuration, “CIFF” identifies the TOHO compact flat-face fitting interface, “3-4” identifies the size and pressure-class combination, and the trailing “NC” confirms normally closed operation. Together these attributes position the TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC as a drop-in flow-control element for analyser sampling lines, chemical dosing headers, semiconductor process tools, and laboratory-scale pilot plants where reproducible, fine-grained adjustment of liquid or gas flow is required.

In an automation architecture, the 4F-AV-N20-N-CIFF-3-4-NC typically sits downstream of a PLC- or DCS-controlled solenoid manifold, translating low-level digital commands into precisely metered process flow while remaining electrically isolated from the wetted stream. Its compact footprint, inert wetted materials, and Japanese-build quality give integrators a dependable, long-service-life alternative to generic quarter-turn valves whenever tight shutoff, gradual modulation, and repeatable set-points matter more than raw throughput.

Request Price

Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	4F-AV-N20-N-CIFF-3-4-NC
Manufacturer	TOHO KASEI CO LTD (Japan)
Product Type	Air-Operated Needle Valve / Pneumatic Flow Control Module
Series / Family	AV Series, Air Operation Valve (4F Function Group)
Nominal Bore	DN20 (≈ 3/4 inch)
Actuation Type	Pneumatic (Air-Operated), Direct-Acting Needle
Fail-Safe Position	Normally Closed (NC)
Connection / Fitting	CIFF compact flat-face fitting interface
Operating Pressure Range	Vacuum to 0.3 MPa (≈ 43 psi) supply side
Control Air Pressure	0.2 – 0.4 MPa dry, oil-free instrument air
Wetted Materials	PTFE (Teflon) needle seal, corrosion-resistant valve body
Operating Temperature Range	0 °C to +80 °C (medium), −10 °C to +60 °C (ambient)
Flow Characteristic	Fine-metering needle trim for gradual throttling
Typical Applications	Semiconductor tools, chemical dosing, analytical sampling

Main Features and Advantages

Fail-safe normally closed actuation is the defining strength of the TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC. Because the internal spring holds the needle firmly on its PTFE seat whenever pilot air is absent, any interruption of the control signal, air compressor trip, or emergency stop immediately isolates the process stream. This behaviour removes an entire class of risk in chemical dosing and solvent-transfer skids, where an open valve on power loss could otherwise flood a reactor or analytical column.

The fine-metering needle trim inside the 4F-AV-N20-N-CIFF-3-4-NC delivers progressive, near-linear flow adjustment across a wide throttle range. Unlike a ball or butterfly valve whose characteristic is essentially on/off, the needle geometry allows operators to dial in micro-flow rates for carrier gas, reagent feed, or purge streams with confidence that the setting will hold over time. The tapered needle and matched seat are machined to tight tolerances, giving bubble-tight shutoff at full closure and repeatable Cv behaviour across thousands of actuation cycles.

Chemical inertness and cleanliness are engineered into the wetted path. The PTFE needle seal and corrosion-resistant body materials tolerate aggressive reagents, solvents, and high-purity water without leaching or swelling, which is why the TOHO KASEI 4F-AV-N20-N-CIFF-3-4-NC appears so frequently on used semiconductor tooling lists alongside liquidHandlers, wet benches, and CVD loading stations. The smooth internal surfaces also resist particulate entrapment, simplifying purge cycles and shortening product changeover.

Mechanical integration is straightforward thanks to the CIFF flat-face fitting interface. The compact, face-seal connection minimises dead volume and allows the valve to be swapped without cutting or re-bending tube runs — a genuine advantage in retrofit projects where panel space is already congested. Lightweight construction and low actuation-air consumption keep the valve compatible with small FRL units and existing plant air supplies, while Japanese manufacturing discipline delivers dimensional consistency that simplifies spare-part stocking and keeps commissioning time predictable for the 4F-AV-N20-N-CIFF-3-4-NC.