WF-YL11-1

Model number: WF-YL11-1
Body material: carbon steel (WCB); 304; 316; 316L
Caliber: DN6-DN100 (1/8-4 inch)

Model: WF-YL11-1
Brand: TechWF
Manufacturer: Wenzhou Weifeng Technology Co., Ltd.
Official Website: www.alvifeng.com
Business Contact: WhatsApp +8618815068623

Core Application Sectors: Heavy Industry | Chemical Process | Precision Agriculture | Offshore & Marine Engineering


1. Product Overview
The WF-YL11-1 stainless steel impeller flow sight indicator is a premium heavy-duty visual pipeline monitoring fitting engineered by TechWF for demanding industrial, chemical, agricultural and offshore marine working conditions.
Manufactured via one-piece precision stainless steel casting, this sight glass adopts a compact straight barrel body, dual female internal thread connections, a top large-view borosilicate sight window and high-sensitivity anti-corrosion star-shaped impeller. It delivers instant visual feedback of fluid velocity, continuous flow status, pipeline dry-up and reverse flow, effectively protecting circulation pumps, chemical reactors, irrigation equipment and offshore seawater circulation systems from dry running, cavitation and mechanical breakdown.

Every unit undergoes rigorous hydraulic burst, salt spray, leakage and thermal cycle aging testing before shipment, delivering consistent long-term performance in high-temperature, high-salinity and mildly corrosive fluid environments worldwide.


2. Premium Technical Specifications
  • Body Material: 304 / 316 stainless steel (passivated matte finish, seawater & weak acid/alkali resistant, food & sanitary compliant)
  • Connection Standard: BSP / NPT female internal thread, full range DN15 – DN50
  • Sight Window: High-pressure resistant borosilicate tempered glass, wide top viewing angle
  • Sealing Assembly: Double-layer FKM fluorine rubber O-ring seal, resistant to acid, alkali, brine and industrial oils
  • Flow Indicator Core: Reinforced blue star multi-blade impeller, ultra-sensitive to micro fluid flow
  • Nominal Working Pressure: PN16 standard; PN25 reinforced marine high-pressure version customizable
  • Operating Temperature Range: -20℃ ~ +180℃
  • Flow Channel Design: Full straight-through full-bore cavity, zero additional pressure drop
  • Marking: Cast integrated flow direction arrow for quick field installation identification


3. Core High-End Industrial Advantages

3.1 Robust Integral Stainless Steel Cast Body

One-piece precision casting forms a smooth inner wall without dead corners, delivering outstanding rust and corrosion resistance. It meets sanitary standards for food, pharmaceutical and offshore seawater fluid pipelines, extending service life under long-term corrosive exposure.


3.2 Full-Bore Unrestricted Flow Path

No internal throttle protrusions generate extra pressure loss; the original pipeline design flow rate is fully retained, making it ideal for precise flow control in fine chemical and sophisticated industrial processes.


3.3 Wide-Angle Top Observation Window

The large top-mounted glass port offers an unobstructed wide viewing angle. Operators can clearly observe impeller rotation speed, fluid impurities and foam regardless of installation orientation.


3.4 Ultra-Sensitive Low-Flow Impeller

Custom star multi-blade impeller responds to minimal fluid flow, accurately detecting low flow, pipeline dry-out and backflow risks to avoid unplanned production shutdown and equipment damage.


3.5 Dual Heavy-Duty Leak-Proof Sealing System

Dual FKM fluororubber sealing rings withstand chemical erosion, salt spray aging and extreme temperature alternation, maintaining zero leakage under continuous full-load operation in chemical and offshore corrosive environments.


3.6 Compact Space-Saving Short Barrel Structure

The integrated short-body design occupies minimal installation space, perfectly fitting built-in equipment pipelines, narrow cabinet layouts and compact unit assemblies.


3.7 Multi-Harsh Environment Qualified Performance

Validated through strict salt spray aging, hot-cold alternating cycle and hydraulic burst testing, the sight indicator reliably runs year-round without interruption for industrial, chemical, agricultural and offshore marine projects.


3.8 Low-Maintenance Industrial Construction

No consumable wearing parts are incorporated; only occasional simple wiping of the sight glass is required, drastically cutting long-term operation and maintenance costs for large-scale engineering projects.


4. Global Cross-Industry Application Scenarios

Heavy Industrial Manufacturing

Circulating cooling water loops, boiler auxiliary pipelines, central HVAC chilled water systems and machine tool hydraulic oil circuits. Prevents pump dry-grinding and equipment cavitation failure.


Chemical & Process Engineering

Conveyance pipelines for weak acid, weak alkali and light chemical solvents, plus chemical intermediate circulation lines. Visual flow monitoring eliminates blockages and material cut-off production halts.


Modern Precision Agriculture

Large-scale farm water supply mains, greenhouse nutrient solution circulation lines, drip & sprinkler irrigation flow inspection. Guarantees uniform water distribution and prevents crop drought yield losses.


Offshore & Marine Engineering

Ship engine room cooling circulation piping, offshore platform fresh & seawater auxiliary lines, marine aquaculture water recirculation systems. Anti-salt corrosion construction adapts to coastal and open-ocean high-salt humid environments.


Supplementary Application Fields

Industrial pure water treatment equipment, solar thermal circulation pipelines, fire protection water branch lines, sanitary food-grade fluid transfer pipelines.


5. Customized Engineering Support Service
  1. Material Customization: 304 stainless steel, 316 stainless steel, 316L marine anti-corrosion grade
  2. Thread Customization: BSP, NPT, G, Rc and non-standard special thread sizes
  3. Pressure Grade Customization: Standard PN16, PN25 reinforced marine high-pressure variant, PN40 ultra-high pressure bespoke model
  4. Sealing Material Matching: EPDM for clean water media, FKM fluororubber for chemical oil & solvent transport
  5. Brand & Packaging Customization: Laser engraved customer LOGO, neutral export carton/wooden case packaging; third-party official test reports available for tender documentation
  6. Caliber Customization: DN15, DN20, DN25, DN32, DN40, DN50 and special non-standard pipe diameters


6. Factory Premium Quality Control Standards
All WF-YL11 series stainless steel flow sight indicators undergo mandatory 100% full inspection prior to dispatch. Standard factory testing includes hydraulic burst pressure testing, sealing leakage testing, salt spray corrosion aging testing, impeller low-flow sensitivity testing and high-low temperature alternating cycle validation.

Complete material certification and full test report packages are supplied to support global engineering tender reviews, offshore marine project audits and chemical plant safety compliance assessments.


Global Business Contact
Manufacturer: Wenzhou Weifeng Technology Co., Ltd.
WhatsApp Business Line: +8618815068623
Official Website: www.alvifeng.com


If you have any enquiry about quotation or cooperation,please feel free to email us at or use the following enquiry form. Our sales will contact you within 24 hours. Thank you for your interest in our products.

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