WF-FQ11-82,Products,Wenzhou WeiFeng Technology Co., Ltd.

1. Product Overview

WF-FQ11-82 bolted full-disassembly straight flow sight indicator is a heavy-duty full-maintainable industrial visual flow monitor independently developed by TechWF. It adopts integrated precision cast 304 stainless steel cylindrical straight body, horizontal symmetrical dual BSP/NPT internal thread ports, top four-bolt fastened detachable thick borosilicate sight window and single high-visibility red anti-corrosion floating ball indicator. The bolted flange structure realizes complete cavity opening for thorough cleaning and component replacement, widely applied in precision industrial cooling, medium corrosive fine chemical, large-scale agricultural irrigation, central HVAC heating, yacht and coastal marine threaded auxiliary pipeline systems.

This sight glass is integrally seamless cast from 304 stainless steel straight cavity, horizontal dual identical internal threads support bidirectional screw installation. Exclusive four-screw bolted upper flange enables full disassembly of the entire observation chamber without cutting pipelines, allowing complete extraction of float balls, filter screens and aging sealing gaskets for deep sanitization and replacement. When fluid flows along the molded directional arrow, medium buoyancy lifts the high-contrast red float ball to display normal circulation; the float sinks fully to the bottom to warn of pipeline cut-off, empty pipe and reverse flow risks. It delivers full-cycle maintainable flow monitoring for precision cooling pumps, chemical dosing pipelines, farm branch irrigation lines and yacht auxiliary cooling loops, eliminating sediment blockage risks and avoiding pump dry-running & equipment overheating failure.

All finished units pass hydraulic burst pressure testing, salt spray anti-corrosion aging testing, bolt flange uniform compression 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 worldwide.

2. Premium Technical Specifications

Body Material: 304 stainless steel precision seamless casting, matte passivated anti-rust finish, food & marine anti-salt corrosion certified
Connection Standard: Horizontal dual symmetrical BSP / NPT internal thread, customizable sizes DN15~DN65
Sight Window: Four-bolt fastened detachable thick borosilicate glass, 270° overhead panoramic omnidirectional observation without blind spots
Indicator Core: Single solid red PP floating ball, lightweight, acid & alkali resistant, rises synchronously under medium buoyancy
Sealing Assembly: Double-layer reinforced EPDM / FKM composite 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, polished smooth inner wall reduces crystal, limescale and fertilizer sediment adhesion
Structural Feature: Cylindrical straight integrated threaded body, four-stainless-steel-bolt fixed detachable top flange, fully openable full cavity for complete component removal and deep flushing

3. Core High-End Competitive Advantages

Integral Seamless Cast 304 Stainless Steel Cylindrical Straight Anti-Corrosion Body

One-piece seamless precision casting eliminates casting pores and internal stagnant dead zones. Matte passivation delivers excellent rust resistance under humid indoor and coastal weak salt fog environments, far superior to brass fittings for weak acid and saltwater working conditions. Smooth horizontal flow channel effectively reduces medium sediment accumulation.
Four-Bolt Fastened Detachable Flange, Full Cavity Complete Maintenance

Exclusive 4-stainless steel bolt locking flange design enables full opening of the entire sight cavity, unlike simple threaded cap models with limited cleaning range. Users can completely take out float balls, filter screens and aging seals without removing the whole fitting from pipelines, realizing zero-dead-corner deep cleaning, ideal for viscous, crystal-prone chemical & fertilizer media pipelines.
Universal Symmetric Horizontal Dual Internal Thread Bidirectional Installation

Identical standard internal threads on both inlet and outlet support bidirectional assembly, compatible with all mainstream threaded pipe fittings without transition nipples, drastically shortening construction cycles for small-branch industrial pipeline networks.
High-Contrast Single Red Float Ball Intuitive Flow Visualization

Distinct solid red float ball forms sharp visual contrast against transparent glass, easy to judge flow state even from long distance. Pure buoyancy-driven mechanical design without fragile springs or swing paddles, 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 matching low-loss flow control demands of precision machine cooling, fine chemical dosing and agricultural branch irrigation threaded systems.
Chemical-Inert Lightweight Float Ball Assembly

PP red float ball resists weak acid, alkali and light saltwater erosion, ultra-lightweight sensitive response to tiny flow changes, no jamming or sticking after long-term 24-hour continuous operation.
270° Omnidirectional Overhead Observation, No View Blockage

Large flat transparent glass creates wide-range overhead viewing, no matter horizontal or vertical pipeline layout, operators can clearly observe float ball status without adjusting installation orientation.
Heavy-Duty Bolted Flange High Safety Performance

Four evenly distributed stainless steel bolts evenly distribute clamping force, effectively preventing glass rupture under pressure fluctuation; double-layer composite gaskets enhance long-term sealing stability for variable temperature industrial working conditions.

4. Global Cross-Industry Application Scenarios

Precision Industrial Machinery & HVAC Cooling

CNC precision machine tool cooling threaded pipelines, injection molding auxiliary circulation lines, building central heating small branch water pipes, solar multi-loop hot water auxiliary tubing; bolted full-disassembly solves sediment blockage pain point of precision cooling micro pipelines with viscous coolant.

Medium Corrosion Light Fine Chemical Industry

Weak acid/alkali solvent threaded branch pipelines, laboratory continuous reagent delivery tubing, water-based coating circulation loops; full disassembly design facilitates regular crystal sludge removal to avoid pipeline clogging and medium leakage accidents.

Large-Scale Precision Agriculture

Greenhouse nutrient solution branch irrigation threaded lines, farm fertilizer dosing auxiliary pipelines, seedling watering micro sub-lines; complete cavity flushing prevents fertilizer sediment buildup that causes uneven irrigation.

Yacht & Coastal Light Marine Anti-Corrosion Systems

Small yacht auxiliary engine cooling threaded circulation lines, coastal aquaculture low-salinity water auxiliary piping, onshore oil field light cooling water sub-loops; 304 stainless steel passivation layer withstands ocean salt fog splash erosion.

Supplementary Auxiliary Fields

Industrial pure water pretreatment small branch pipelines, fire protection micro clean water threaded lines, compressor & 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 and pressure class
Pressure Grade Customization: PN16 standard, PN20 high-pressure reinforced variant
Sealing Material Matching: Food-grade EPDM for water & edible media, FKM fluororubber upgrade for weak acid/alkali organic solvent transportation
Brand & Packaging Customization: Laser engraved customer LOGO on cylindrical straight 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, DN65 non-standard threaded sizes available

6. Factory Premium Quality Control Standards

All WF-FQ11 series four-bolt full-disassembly straight threaded float ball sight indicators implement mandatory 100% full inspection prior to shipment. Standard factory testing items include hydraulic burst pressure test, four-bolt uniform compression sealing leakage test, salt spray long-cycle anti-corrosion aging test, float ball 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.