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

1. Product Overview

WF-FQ11-26 vertical T-type internal thread double 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, two symmetrical horizontal BSP/NPT internal thread ports, top detachable thick borosilicate sight window and dual-color anti-corrosion floating ball indicator. Vertical elevated observation window design delivers unobstructed top-down viewing, widely applied in industrial equipment cooling, light fine chemical, agricultural greenhouse branch 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, symmetrical horizontal dual internal threads support bidirectional screw installation. The raised top transparent sight cavity holds two high-contrast red & blue PP float balls; fluid buoyancy lifts the dual floats when medium flows normally, while floats sink to the bottom under cut-off or backflow state to warn operators of empty pipe, pipeline blockage and reverse medium flow. It provides intuitive low-cost real-time flow monitoring for small circulation pumps, micro dosing pipelines, greenhouse branch irrigation lines and yacht auxiliary cooling loops, effectively preventing pump dry-running, cavitation and heat exchanger overheating damage.

All finished units pass hydraulic burst pressure testing, salt spray anti-corrosion aging testing, thread sealing leakage testing 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 globally.

2. Premium Technical Specifications

Body Material: 304 stainless steel precision seamless casting, matte passivated anti-rust finish, food & marine sanitary compliant
Connection Standard: Horizontal dual symmetrical BSP / NPT internal 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: Dual-color PP floating balls, lightweight, chemical inert, rises synchronously under fluid 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 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 residue adhesion
Structural Feature: Vertical T-shaped integrated threaded body, elevated snap-on top glass cover, fully disassemblable to extract dual 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 raised observation chamber avoids pipeline frame obstruction for overhead viewing. Matte passivation delivers superior rust resistance under humid indoor and coastal weak salt fog environments, far more durable than brass sight glasses for weak acid and saltwater working conditions. Smooth seamless horizontal flow channel prevents medium sediment buildup.
Universal Symmetric Horizontal Dual Internal Thread Bidirectional Installation

Identical standard internal threads on both horizontal inlet and outlet support bidirectional assembly, compatible with all common threaded pipe fittings without transition nipples, greatly shortening construction time for small-branch threaded pipeline projects.
Dual-Color Float Ball High-Contrast Visual Flow Feedback

Distinct red & blue dual float balls create sharp visual contrast against transparent glass, easy to judge flow status even from long distance. Dual float design improves visibility under low flow velocity; no complex springs, swing paddles or dial components, ultra-low failure rate and long 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 Dual Float Ball Assembly

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

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

Vertical elevated sight window design avoids horizontal pipeline bracket occlusion, fits densely arranged overhead instrument racks, narrow cabinet internal cooling lines and compact yacht engine room tiny piping where flat top sight glasses cannot be clearly observed.
Simple Robust Low-Failure Mechanical Structure

Only two moving float ball components, no 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 raised sight window solves viewing blockage issue 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; dual 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 internal 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 threaded float ball sight indicators implement mandatory 100% full inspection prior to shipment. Standard factory testing items include hydraulic burst pressure test, dual-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.