WF-FQ11-033,Products,Wenzhou WeiFeng Technology Co., Ltd.

1. Product Overview

WF-FQ11-033 brass dome window float ball sight flow indicator is a compact mini panoramic inline visual flow monitor independently developed by TechWF. It adopts integrated hot-forged H59 solid brass horizontal straight body, symmetrical dual BSP/NPT internal thread ends, unique hemispherical dome borosilicate sight window and dual-color anti-corrosion floating ball indicator. The convex dome glass delivers 180° ultra-wide panoramic viewing angle with zero blind spots, allowing operators to observe pipeline flow state from any side. It is widely deployed in HVAC heating, light neutral fine chemical, precision agricultural irrigation, light industrial machinery cooling, yacht and coastal onshore light marine small-bore threaded auxiliary pipeline systems.

This sight glass is integrally hot-forged from solid H59 brass alloy with seamless smooth inner cavity, symmetrical full internal threads support bidirectional screw-on assembly to match all standard female threaded pipe fittings. The protruding hemispherical dome transparent window expands internal observation space, equipped with high-contrast red & blue PP float balls. When medium flows forward following the directional arrow, fluid buoyancy lifts the dual floats to display normal circulation; if flow stops or reverses, the float balls sink fully to the bottom to alert staff of pipeline cut-off, empty pipe and backflow risk. It provides economical real-time visual 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 failure.

All finished units pass hydraulic burst pressure testing, brass anti-oxidation aging testing, thread sealing leakage testing and hot-cold alternating cycle validation before factory delivery, maintaining stable zero-leak continuous operation under clean water, glycol, neutral light solvent and low-salinity coastal cooling water media globally.

2. Premium Technical Specifications

Body Material: Hot-forged solid H59 brass alloy, sandblasted anti-oxidation matte finish, rust-proof for neutral low-corrosion water-based media
Connection Standard: Horizontal dual symmetrical BSP / NPT internal thread, available sizes DN8~DN40
Sight Window: Hemispherical dome thick high-pressure resistant borosilicate glass, 180° omnidirectional panoramic viewing without visual blind angles
Indicator Core: Dual-color PP floating balls, lightweight, chemically inert, floats synchronously under fluid buoyancy
Sealing Assembly: Single-layer EPDM / FKM O-ring gaskets; EPDM for clean water & food-grade media, FKM for neutral weak solvent & brine media
Nominal Working Pressure: PN16 standard grade; PN20 high-pressure reinforced version optional
Operating Temperature Range: -10℃ ~ +110℃
Flow Channel: Straight full-bore inner cavity, zero extra pressure drop, smooth polished inner wall reduces limescale, fertilizer and organic residue adhesion
Structural Feature: Compact straight integrated brass threaded body, snap-on dome glass cap, fully detachable to extract dual float balls for deep flushing without pipeline disassembly

3. Core High-End Competitive Advantages

Solid Hot-Forged H59 Brass Anti-Oxidation Straight Body

One-piece solid hot forging eliminates casting pores and internal stagnant dead zones; sandblasted matte brass surface resists oxidation and discoloration under humid indoor and coastal weak salt fog environments, no surface coating peeling risk. Compact straight block structure saves installation space for dense small instrument pipelines for neutral water-based working conditions.
Universal Symmetric Dual Internal Thread Bidirectional Installation

Identical standard internal threads on both inlet and outlet support arbitrary bidirectional assembly, compatible with all mainstream industrial threaded pipe fittings without transition nipples, drastically shortening construction cycles for small-branch threaded pipeline networks.
Unique Hemispherical Dome Panoramic Sight Window, Ultra-Wide View Angle

Convex hemispherical dome glass enlarges internal observation space to realize 180° full lateral viewing, no blind angle even when installed close to walls or pipe supports. Distinct red & blue dual float balls create sharp visual contrast against transparent dome glass for long-distance flow identification. Pure buoyancy-driven structure without complex springs or swing paddles delivers ultra-low failure rate and extended service life.
Zero Pressure Loss Full-Bore Unrestricted Flow Path

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

PP float balls resist neutral weak acid, alkali and light saltwater erosion, ultra-lightweight with sensitive response to tiny flow changes, no jamming or sticking after long-term 24-hour continuous operation.
Detachable Snap-On Dome Cap Low-Maintenance Design

Thread locking dome cap 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.
Mini Compact Horizontal Space-Saving Layout

Flat horizontal straight brass body occupies minimal vertical installation height, fits densely arranged overhead instrument racks, narrow cabinet internal cooling lines and compact yacht engine room tiny piping where vertical sight glasses cannot be installed.
Simple Robust Low-Failure Mechanical Structure

Only two moving float ball components without fragile elastic or rotating parts, minimal failure points, stable continuous operation for long-term industrial 24-hour cooling production lines.

4. Global Cross-Industry Application Scenarios

HVAC & Light Industrial Machinery 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; compact brass body matches narrow equipment internal installation gaps, dome window avoids viewing blockage from pipe supports.

Neutral Light Fine Chemical Industry

Neutral water-based solvent small threaded branch pipelines, laboratory micro reagent delivery tubing, water-based coating low-pressure circulation loops; H59 brass alloy is compatible with neutral non-acidic/alkaline media without metal ion contamination.

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 fertilizer liquid flow state without corrosion from mild nutrient solutions.

Yacht & Coastal Onshore Light Marine Systems

Small yacht auxiliary engine cooling threaded circulation lines, coastal aquaculture low-salinity water auxiliary piping, onshore light cooling water sub-loops; brass anti-oxidation surface withstands weak coastal salt fog splash erosion for short-term marine service.

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 H59 forged brass, food-grade brass body optional for drinking water media
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 neutral weak solvent transportation
Brand & Packaging Customization: Laser engraved customer LOGO on brass straight body, neutral anti-collision export wooden case packaging; complete material & pressure test certificates provided for tender documentation
Caliber Customization: DN8, DN10, DN15, DN20, DN25, DN32, DN40 non-standard threaded sizes available

6. Factory Premium Quality Control Standards

All WF-FQ11 series brass dome window 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, brass anti-oxidation aging test, float ball low-flow sensitivity test and cold-hot alternating cycle validation.

Complete brass 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.