WF-BB11-069,Products,Wenzhou WeiFeng Technology Co., Ltd.

1. Product Overview

WF-BB11-069 four-stud split threaded swing paddle flow sight indicator is a disassemblable heavy-duty mini inline visual flow monitor independently developed by TechWF. It adopts a split four long pull-rod clamping structure with internal thread connection, equipped with a calibrated swing paddle dial to realize quantitative real-time flow observation. Widely applied in sanitary fine chemical, HVAC heating, precision agricultural irrigation, yacht and coastal marine auxiliary threaded pipeline systems.

This sight glass is precision cast from 304/316 stainless steel into an integrated T-shaped cylinder body with symmetrical BSP/NPT internal thread ends. The four full-length stainless steel studs evenly compress the top sight frame and double-layer sealing gaskets, featuring balanced stress, high pressure resistance and convenient full disassembly without cutting the pipeline. The built-in weighted swing paddle with printed scale dial can visually judge flow velocity, pipeline emptying, clogging and reverse flow, providing early low-flow warning to protect small circulation pumps, micro reactors, branch irrigation equipment and ship cooling loops from dry-running and cavitation damage.

All finished products pass hydraulic burst pressure testing, long-cycle salt spray anti-corrosion aging testing, four-stud uniform compression leakage testing and hot-cold alternating cycle verification before delivery, ensuring 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 / 316 stainless steel precision casting, matte passivated anti-corrosion finish, food & marine sanitary compliant
Connection Standard: BSP / NPT internal thread, complete sizes DN15~DN50 customizable
Sight Window: Thick-wall high-pressure resistant round borosilicate top glass, 270° vertical downward full panoramic viewing without blind spots
Fastening Structure: Four symmetric full-length stainless steel pull studs + square top clamping flange, uniform stress distribution to avoid glass cracking under pressure fluctuation and water hammer
Sealing Assembly: Double-layer EPDM / FKM composite O-ring seals; EPDM for clean water & edible media, FKM for solvent & brine media
Flow Indicator Core: Weighted swing paddle with quantitative scale dial, acid/alkali/saltwater corrosion resistant, highly sensitive to micro low flow
Nominal Working Pressure: PN16 standard grade; PN25 marine high-pressure reinforced version optional
Operating Temperature Range: -20℃ ~ +180℃
Flow Channel Design: Full straight-through full-bore inner cavity, zero extra pressure drop, smooth seamless inner wall reduces residue adhesion
Structural Feature: Split four-stud detachable structure, internal thread ends, fully disassemblable top assembly for paddle extraction and deep cavity flushing without pipeline removal

3. Core Competitive Advantages

Split Four Pull-rod Balanced Clamping Structure

Four full-length stainless steel studs disperse clamping force evenly across the entire sight glass and gaskets, eliminating local gasket extrusion risk under frequent pressure swings. The split design enables full separation of the top viewing module without cutting pipelines, greatly simplifying maintenance.
Anti-Corrosion Cast Stainless Steel Integrated T-Body

Seamless precision casting eliminates internal stagnant dead zones; smooth inner surface prevents organic, crystal and fertilizer sediment buildup. 316 upgraded material delivers outstanding ocean salt fog resistance for coastal and marine threaded pipelines.
Universal Internal Thread Quick Installation

Dual symmetrical standard internal threads support bidirectional screw-on assembly with all common threaded pipe fittings, no welding or flanges required, shortening small branch pipeline construction cycles significantly.
Quantitative Calibrated Swing Paddle Visualization

Different from simple star impeller sight glasses, the scaled swing paddle displays approximate flow volume intuitively, not merely on/off flow status, facilitating real-time process flow adjustment for operators.
Zero Pressure Loss Full-Bore Unrestricted Flow Path

No internal protruding throttle structures create additional pressure loss, fully retaining original pipeline flow capacity, perfectly matching low-loss micro circulation loop demands.
Chemical-Inert Swing Paddle Assembly

Composite PPS paddle maintains stable swing performance under long-term contact with acid, alkali and brine, avoiding jamming and corrosion failure in corrosive medium pipelines.
Compact Detachable Mini Layout

Small cylindrical split threaded structure occupies minimal linear space, ideal for densely arranged instrument racks, clean room branch lines and compact yacht engine room threaded piping.
Dual Redundant Anti-Aging Sealing System

Dual independent elastic sealing rings form double leak-proof protection. FKM option resists chemical erosion, salt spray and extreme temperature shifts for year-round non-stop full-load operation.

4. Global Industry Application Scenarios

Sanitary Food & Pharmaceutical Manufacturing: Purified water branch circulation, beverage & dairy small transfer pipelines, cosmetic raw material micro delivery lines; stainless steel meets food-contact hygiene standards, split structure supports regular CIP deep cleaning.
Fine Corrosive Chemical Engineering: Weak acid/alkali solvent threaded branch pipelines, electroplating small circulation loops, laboratory reagent delivery tubing; inert wetted surface prevents metal ion contamination of high-purity chemical products.
Large-Scale Precision Agriculture: Greenhouse nutrient solution branch irrigation threaded lines, farm water supply sub-pipes, fertilizer dosing auxiliary pipelines; anti-corrosion stainless steel withstands long-term agricultural chemical erosion, easy disassembly to clear fertilizer scale.
Yacht & Coastal Marine Systems: Small ship engine room cooling threaded circulation lines, coastal aquaculture low-salinity water auxiliary pipelines, yacht fresh water recirculation loops; 316 variant resists ocean salt fog splash corrosion.
Auxiliary Supporting Fields: HVAC heating branch water lines, small solar hot water circulation pipelines, fire protection small branch clean water piping, industrial pure water pretreatment sub-equipment.

5. Customization Service

Material: Standard 304 stainless steel, upgrade to 316 marine high anti-corrosion sanitary grade
Thread Standard: Custom BSPP, BSPT, NPT thread specifications
Pressure Grade: PN16 standard, PN25 marine high-pressure reinforced variant, PN40 ultra-high pressure bespoke model
Sealing Material: Food-grade EPDM for water & edible media, FKM fluororubber for acid, alkali and solvent transportation
Brand & Packaging: Laser engraved customer LOGO on cylinder body, anti-collision neutral export wooden case packaging; complete anti-corrosion material test certificates and pressure inspection reports for tender documents
Caliber: DN15, DN20, DN25, DN32, DN40, DN50 non-standard sizes available

6. Factory Quality Control Standard

All WF-BB11 series threaded split flow sight indicators implement mandatory 100% full inspection before shipment, including hydraulic burst pressure test, four-stud uniform compression leakage test, salt spray long-cycle corrosion aging test, paddle low-flow sensitivity test and hot-cold alternating cycle validation.

Complete stainless steel material certification, sanitary inspection reports and full pressure vessel test packages can be provided to support global food/pharma tender reviews, offshore marine equipment audits and sanitary workshop safety compliance assessments.