Loc-Line 21193 Female NPT Valve for 1/4″ ID System – Pack of 2

About This Product

The Loc-Line 21193 Female NPT Valve for 1/4″ ID System is a durable, manually adjustable flow-control valve designed for use with Loc-Line’s versatile 1/4-inch modular hose system. Featuring a 1/4-inch female National Pipe Taper (NPT) threaded connection and a compatible Loc-Line modular hose connection, this compact valve allows users to regulate or shut off fluid flow directly at the supply connection.

Manufactured by Lockwood Products, Inc., the Loc-Line 21193 provides a convenient solution for connecting adjustable modular hose assemblies to compatible male NPT-threaded fittings. Its integrated valve eliminates the need for a separate shutoff component in many installations.

The Loc-Line modular hose system is recognized for its unique ball-and-socket construction, allowing users to position fluid delivery lines precisely where needed. By adding the 21193 Female NPT Valve, operators gain convenient control over the liquid delivered through individual hose assemblies.

The valve features a quarter-turn shutoff mechanism, allowing users to open or close the flow with a simple adjustment. Intermediate positions can be used to reduce flow when full delivery is unnecessary.

This versatility makes the valve particularly useful for precision machining, CNC coolant applications, industrial fluid delivery, and other compatible systems where individual outlets require adjustable flow rates.

Constructed from acetal copolymer with a nitrile (Buna-N) stem seal, the valve is designed to withstand many common industrial fluids while providing a durable, corrosion-resistant alternative to metal fittings.

The valve features a full 1/4-inch internal flow passage and is designed to connect to Loc-Line’s corresponding modular hose components. Its compact construction makes it useful where conventional valves may require additional installation space.

The manufacturer’s technical literature lists a maximum working pressure of 100 PSI for the female NPT valve itself. However, standard Loc-Line 1/4-inch hose assemblies are limited to 30 PSI, which determines the operating limit for most complete modular hose installations.

Each package includes two Loc-Line 21193 Female NPT Valves, making it convenient to install multiple independently controlled fluid lines or keep a replacement component available.

Whether you’re upgrading an existing coolant delivery system, replacing a worn valve, or designing a custom modular fluid-handling assembly, the Loc-Line 21193 offers practical flow control, dependable construction, and convenient installation.

Features:

• 1/4-inch female NPT threaded connection attaches to compatible male-threaded fluid supply fittings.
• Compatible with Loc-Line 1/4-inch modular hose systems for adjustable fluid delivery applications.
• Quarter-turn valve operation provides convenient manual shutoff.
• Adjustable flow control allows the valve to be fully opened, partially opened, or closed.
• Full 1/4-inch internal passage provides the manufacturer’s specified valve bore.
• Durable acetal copolymer body offers strength, dimensional stability, and resistance to many industrial fluids.
• Nitrile (Buna-N) stem seal provides sealing within the valve mechanism.
• Corrosion-resistant construction is suitable for compatible fluid-handling environments.
• Pack of two valves supports dual-outlet installations or replacement needs.
• Compact modular design reduces the need for larger conventional valves.
• Independent outlet control allows separate fluid lines to be adjusted without changing the main supply.
• Suitable for CNC coolant delivery provides localized flow regulation for machining applications.
• Compatible with adjustable Loc-Line hose segments allows flexible positioning of connected nozzles.
• Simple threaded installation connects to appropriately sized male NPT fittings.
• Blue-and-orange design matches the standard Loc-Line modular hose system.
• Electrically nonconductive plastic construction supports appropriate industrial applications.
• Serviceable modular connection allows compatible hose assemblies to be disconnected or reconfigured.
• Made in the USA according to published manufacturer and distributor information.

Specifications:

Specification	Details
Brand	Loc-Line
Manufacturer	Lockwood Products, Inc.
Product Name	1/4″ Female NPT Valve
Manufacturer Part Number	21193
Product SKU / UPC Reference	662633211934
Product Type	Manual Flow-Control / Shutoff Valve
Package Quantity	2 Valves
Loc-Line System Size	1/4 inch
Thread Size	1/4 inch
Thread Type	NPT – National Pipe Taper
Thread Gender	Female
Connection Configuration	1/4″ Loc-Line × 1/4″ Female NPT
Internal Passage	1/4 inch
Valve Operation	Manual Quarter-Turn
Flow Adjustment	Open, Partially Open, Closed
Body Material	Acetal Copolymer
Stem Material	Acetal Copolymer
Stem Seal	Nitrile (Buna-N)
Color	Blue and Orange
Manufacturer Valve Pressure Rating	Up to 100 PSI
Standard 1/4″ Hose Pressure Limit	30 PSI
Distributor-Listed Maximum Pressure	55 PSI
Distributor-Listed Maximum Flow	250 GPH
Distributor-Listed Maximum Temperature	170°F (77°C)
Corrosion Resistant	Yes
Primary Application	Modular Fluid and Coolant Flow Control
Compatible System	Loc-Line 1/4″ Modular Hose
Country of Origin	USA, Subject to Change

Pressure rating clarification: Loc-Line’s technical catalog specifies 100 PSI for the individual female NPT valve but limits standard 1/4-inch modular hose assemblies to 30 PSI. A distributor separately lists 55 PSI for this product. The safe operating limit is determined by the lowest-rated component in the complete installation; standard hose-based installations should not exceed the manufacturer’s 30 PSI hose limit.

Package Contents

Component	Quantity
Loc-Line 21193 Female NPT Flow-Control Valve	2

Loc-Line hose segments, nozzles, threaded supply fittings, pumps, and additional accessories are sold separately unless specifically included in the product listing.

Key Benefits

Convenient Female NPT Connection

The integrated female NPT connection allows the valve to attach directly to compatible male-threaded supply fittings.

This makes it easy to connect conventional threaded plumbing or equipment outlets to a flexible Loc-Line modular hose assembly.

Precise Manual Flow Control

The valve allows users to adjust liquid flow independently at an individual outlet.

By partially opening or closing the valve, operators can reduce flow when full output is unnecessary.

The quarter-turn design provides convenient shutoff during equipment adjustment or maintenance.

Durable Acetal Construction

Acetal copolymer offers strength, corrosion resistance, and dimensional stability for a variety of compatible fluid-handling applications.

The nitrile stem seal provides a sealing interface within the valve assembly.

Always verify material compatibility with the specific liquid being transported.

Modular Hose Flexibility

Loc-Line’s ball-and-socket hose system allows users to position nozzles and fluid outlets in different directions.

When combined with the 21193 valve, the system provides both adjustable hose positioning and localized flow control.

Two-Valve Package

Each package includes two valves, providing a practical solution for applications requiring multiple separately controlled lines.

The additional valve may also be retained as a replacement component for future maintenance.

Recommended Applications

CNC Machine Coolant Systems

The Loc-Line 21193 is particularly useful for machine-tool coolant delivery.

Install the valve on a compatible male NPT supply connection and attach suitable Loc-Line hose segments and nozzles to direct coolant toward the cutting area.

Workshop Fluid Distribution

Create adjustable delivery lines for compatible workshop equipment where manually regulated liquid flow is required.

Custom Industrial Cooling Systems

Use the valve to regulate fluid delivery in appropriately designed cooling or lubrication assemblies.

Ensure that operating pressure, fluid chemistry, and temperature remain within the limits of the complete system.

Laboratory and Equipment Applications

The compact valve may be used in compatible fluid-handling equipment requiring a small female-threaded connection and adjustable modular outlet.

Aquarium and Pond Equipment Projects

The valve may be considered for certain above-water, custom fluid-routing applications when the system’s operating conditions and material compatibility have been evaluated.

This product is not specifically certified by the manufacturer for aquarium life-support systems, potable water, or submerged operation. Do not assume those uses are approved.

Installation and Usage Instructions

1. Verify Compatibility

Confirm that the supply fitting uses 1/4-inch male NPT threads.

Verify that the modular hose and connected accessories belong to the Loc-Line 1/4-inch system.

Do not confuse NPT threads with BSP, metric, or other threaded connections.

2. Shut Off the Fluid Supply

Turn off the pump or fluid supply before beginning installation.

Relieve any residual pressure from the line.

3. Inspect the Valve

Examine the female threads, modular connection, valve handle, and body for visible damage.

Confirm that the handle rotates properly.

4. Install the Female NPT Connection

Attach the valve to the compatible male NPT fitting.

Use a thread-sealing product appropriate for plastic NPT connections and the transported fluid, following the equipment manufacturer’s instructions.

Avoid excessive tightening, which could damage or split the plastic valve body.

5. Connect the Loc-Line Hose

Attach the compatible 1/4-inch modular hose assembly to the valve.

Ensure the ball-and-socket connection is securely seated.

Position the hose and nozzle for the intended application.

6. Restore Fluid Flow

Gradually restore the fluid supply.

Inspect the threaded and modular connections for leaks.

7. Adjust the Valve

Turn the valve handle to open, reduce, or stop fluid flow.

Do not force the mechanism beyond its intended range of movement.

8. Verify Operating Pressure

Confirm that the complete assembly operates within the pressure limit of its lowest-rated component.

For standard Loc-Line 1/4-inch hose assemblies, follow the manufacturer’s 30 PSI maximum working pressure.

Maintenance and Care Recommendations

Inspect the valve periodically for leaks, cracking, worn threads, and damaged connections.

Keep the valve mechanism and modular connection free from dirt and accumulated deposits.

Operate the quarter-turn handle periodically to confirm smooth movement.

Do not force a stuck valve or use excessive leverage on the adjustment handle.

Clean the exterior with methods suitable for acetal plastic.

Avoid using chemicals or solvents without confirming compatibility with both the acetal body and nitrile seal.

Disconnect the fluid supply and relieve pressure before removing the valve.

Replace damaged valves rather than attempting repairs that could compromise pressure integrity.

Protect the fitting from freezing conditions that could cause trapped liquid to expand.

Important Product Information

The Loc-Line 21193 is a 1/4-inch Female NPT Valve supplied in a pack of two.

It is designed to connect a compatible male NPT-threaded supply line to the Loc-Line 1/4-inch modular hose system.

This valve provides manual flow regulation and shutoff.

It is not a check valve. It does not automatically prevent reverse flow.

Other Loc-Line valve models include:

• 21192: 1/4-inch Male NPT Valve
• 21193: 1/4-inch Female NPT Valve
• 21194: 1/4-inch In-Line Valve
• 21191: 1/4-inch In-Line Check Valve

These fittings serve different connection and flow-control purposes and should not be treated as interchangeable.

The manufacturer lists a 100 PSI pressure rating for the individual male and female NPT valves, but standard 1/4-inch Loc-Line hose is limited to 30 PSI. Always follow the lowest-rated component in the assembled system.

This product is intended primarily for compatible industrial fluid and coolant delivery applications. Aquarium, potable-water, and other specialized uses require independent suitability verification.

Recommended application: A durable, quarter-turn manual flow-control valve designed to connect 1/4-inch male NPT supply fittings to compatible Loc-Line 1/4-inch modular hose assemblies. Featuring an acetal copolymer body, nitrile stem seal, adjustable flow control, and a convenient two-pack configuration, the Loc-Line 21193 is ideal for CNC coolant delivery, workshop fluid systems, and other appropriately designed modular fluid-handling applications.