WF-FQ11-26A,Products,Wenzhou WeiFeng Technology Co., Ltd.

1. Product Overview

WF-FQ11-26A double external thread vertical T-type float ball sight flow indicator is a compact heavy-duty inline visual flow monitor independently developed by TechWF. It adopts integrated precision cast 304 stainless steel vertical T cylindrical body, symmetrical dual BSP/NPT male external thread ports, top detachable thick borosilicate sight window and single/twin anti-corrosion floating ball indicator. Vertical raised overhead viewing window avoids pipeline bracket obstruction, widely applied in industrial machinery cooling, light fine chemical, agricultural greenhouse irrigation, HVAC heating, yacht and coastal marine small-bore threaded auxiliary pipeline systems.

This sight glass is integrally seamless cast from 304 stainless steel vertical T cavity, identical male external threads on both ends support bidirectional screw-on installation with standard female threaded pipe fittings. The elevated top transparent sight cavity holds high-contrast colored PP float balls; fluid buoyancy lifts floats under normal medium flow, while floats sink to bottom to alert operators of pipeline cut-off, empty pipe and reverse flow. It delivers low-cost real-time visual monitoring for small circulation pumps, micro dosing pipelines, branch irrigation lines and yacht auxiliary cooling loops, effectively preventing pump dry-running, cavitation and equipment overheating damage.

All finished units pass hydraulic burst pressure test, salt spray anti-corrosion aging test, external thread sealing leakage test and hot-cold alternating cycle validation before factory delivery, maintaining stable zero-leak continuous operation under purified water, glycol, weak acid/alkali and low-salinity seawater media worldwide.

2. Premium Technical Specifications

Body Material: 304 stainless steel precision seamless casting, matte passivated anti-rust finish, compliant with food contact and marine anti-salt corrosion standards
Connection Standard: Horizontal dual symmetrical BSP / NPT male external thread, customizable sizes DN15~DN50
Sight Window: Raised vertical thick high-pressure resistant round borosilicate glass, 270° overhead panoramic viewing without visual blind angles
Indicator Core: Single / dual color PP floating balls, lightweight, acid & alkali resistant, floats upward under medium buoyancy
Sealing Assembly: Single-layer EPDM / FKM composite O-ring gaskets; EPDM for clean water & edible media, FKM for weak solvent & brine media
Nominal Working Pressure: PN16 standard grade; PN20 high-pressure reinforced marine version optional
Operating Temperature Range: -10℃ ~ +120℃
Flow Channel: Horizontal straight full-bore inner cavity, zero extra pressure drop, smooth polished inner wall reduces limescale, fertilizer and organic sediment adhesion
Structural Feature: Vertical T-shaped integrated male thread body, elevated thread lock top glass cover, fully disassemblable to extract float balls for deep flushing without pipeline disassembly

3. Core High-End Competitive Advantages

Integral Seamless Cast 304 Stainless Steel Vertical T Anti-Corrosion Body

One-piece seamless precision casting eliminates casting pores and internal stagnant dead zones. Vertical elevated observation chamber completely avoids occlusion from horizontal pipeline supports, enabling unobstructed overhead inspection. Matte passivation delivers superior rust resistance in humid indoor and coastal weak salt fog environments, outperforming brass sight glasses under weak acid and saltwater working conditions. Smooth seamless horizontal flow channel prevents medium residue buildup.
Universal Symmetric Dual Male External Thread Bidirectional Installation

Uniform standard male external threads on both inlet and outlet support bidirectional assembly, compatible with all common female threaded pipe fittings without transition nipples, drastically shortening construction time for small-branch threaded pipeline projects.
High-Contrast Float Ball Intuitive Flow Visualization

Distinct colored float balls create sharp contrast against transparent glass, allowing clear flow state identification even from long distances. No complex springs, swing paddles or dial components; pure buoyancy-driven structure features ultra-low failure rate and extended service life.
Zero Pressure Loss Horizontal Full-Bore Unrestricted Flow Path

No protruding throttle obstacles inside the horizontal cavity, fully retains original pipeline flow capacity, perfectly suited for low-flow micro cooling circulation pipelines of CNC machinery, heating equipment and agricultural micro dosing systems.
Chemical-Inert Lightweight Float Ball Assembly

PP float balls resist weak acid, alkali and light saltwater erosion, ultra-lightweight for sensitive response to tiny flow changes, no jamming or sticking after long-term 24-hour continuous operation.
Raised Detachable Top Cover Low-Maintenance Design

Elevated threaded locking top cover can be manually unscrewed without special tools, quickly take out float balls to flush accumulated limescale, fertilizer sludge and oil deposits, convenient regular routine maintenance and online CIP cleaning.
Vertical T Compact Space-Saving Layout

Vertical raised sight window design solves the viewing blockage issue of flat-top sight glasses caused by horizontal pipe brackets, fitting densely arranged overhead instrument racks, narrow cabinet internal cooling lines and compact yacht engine room tiny piping.
Simple Robust Low-Failure Mechanical Structure

Only float ball moving components without fragile elastic or rotating parts, minimal failure points, capable of stable 24-hour non-stop industrial continuous operation.

4. Global Cross-Industry Application Scenarios

Industrial Machinery & HVAC Cooling Industry

CNC machine tool cooling threaded pipelines, injection molding machine auxiliary circulation lines, building heating small branch water pipes, solar hot water auxiliary circulation tubing; vertical elevated sight window eliminates viewing obstruction from horizontal pipe supports.

Light Fine Chemical Industry

Neutral weak acid/alkali solvent small threaded branch pipelines, laboratory micro reagent delivery tubing, water-based coating low-pressure circulation loops; 304 stainless steel avoids metal ion contamination of high-purity chemical raw materials.

Large-Scale Precision Agriculture

Greenhouse nutrient solution branch irrigation threaded lines, farm small fertilizer dosing auxiliary pipelines, seedling watering micro sub-lines; anti-corrosion float ball reliably displays weak fertilizer liquid flow state.

Yacht & Coastal Light Marine Systems

Small yacht engine room cooling threaded circulation lines, coastal aquaculture low-salinity water auxiliary piping, onshore cooling water sub-loops; stainless steel passivation layer withstands weak coastal salt fog splash erosion.

Supplementary Auxiliary Fields

Industrial pure water pretreatment small branch pipelines, fire protection micro clean water threaded lines, compressor and hydraulic equipment auxiliary cooling circulation tubing.

5. Customized Engineering Support Service

Material Customization: Standard 304 stainless steel, upgrade to 316 / 316L marine high anti-corrosion sanitary grade
Thread Standard Customization: Custom BSPP, BSPT, NPT male external thread specifications
Pressure Grade Customization: PN16 standard, PN20 high-pressure reinforced variant
Sealing Material Matching: Food-grade EPDM for water & edible media, FKM fluororubber for weak acid/alkali organic solvent transportation
Brand & Packaging Customization: Laser engraved customer LOGO on vertical T body, neutral anti-collision export wooden case packaging; complete material & pressure test certificates provided for tender documentation
Caliber Customization: DN15, DN20, DN25, DN32, DN40, DN50 non-standard threaded sizes available

6. Factory Premium Quality Control Standards

All WF-FQ11 series vertical T male thread float ball sight indicators implement mandatory 100% full inspection prior to shipment. Standard factory testing items include hydraulic burst pressure test, dual external thread uniform compression sealing leakage test, salt spray long-cycle anti-corrosion aging test, float ball low-flow sensitivity test and cold-hot alternating cycle validation.

Complete stainless steel material certification, sanitary inspection reports and full pressure vessel test packages can be supplied to support global machinery cooling, light chemical, agricultural and coastal marine engineering tender reviews and equipment safety compliance audits.