Check Valves

Housed Inline Duckbill Check Valve

PN6 / PN10 / 150LB
DN150~DN1200
NR, NBR, EPDM

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Housed Inline Duckbill Check Valve Descriptions

Housed inline duckbill check valve is also called rubber slow close check valve. Duckbill check valve, which has special structure like duckbill. It is one new water supply and drainage valve which has the function of discharge in positive direction while non-return in opposite direction. Housed inline type duckbill check valve is mounted into the pipe. Its shape and dimensions can be changed easily according to customer’s requests. In-line duckbill check valve is applicable widely to rain water, river water, sea water, slurry and industrial sewage. Flowspec Luokai can produce the housed inline duckbill check valve with size from DN150 (6″) to DN1200 (48″). Contact us today. Get the better prices. 30 years of experience. Great after-sales service.

1. FEATURES

  • Adopts all-rubber materials in which include reinforced fibers, which has simple structure, non-corrosive performance and no mechanical parts.
  • Has strong operating performance, which can provide efficient and silent operation without any more energy device, reducing operating costs.
  • Applicable to general operating conditions, and special conditions of wearing and corrosive mediums, such like water, sludge, and mud.
  • Excellent effects of prevent of back flow.
  • Duckbill check valve use differential pressure between its inside and outside to achieve open and close naturally, so that it’s the best choice of waste water drainage system and pipeline system.

3. STANDARDS

  • Design & manufacturing: manufacturer’s standard
  • Face to face: manufacturer’s standard
  • Flanged ends: DIN PN10/16, ANSI150LB, JIS10K, and UNI EN1092 table D/E
  • Inspection & testing: manufacturer’s standard

2. TECHNICAL SPECIFICATIONS

  • PN6 / PN10 / PN16 / JIS10 / 150LB
  • Size: 6″~48″ (DN150~DN1200mm)
  • Materials: Pure Gum Rubber, Neoprene, Chlorobutyl,NBR, Polyurethane, Hypalon, Viton, EPDM

4. APPLICATIONS

  • Waste water system
  • Drainage system
  • Dam drainage
  • Airport and highway water drainage
  • Sewage pool drainage
  • Odor separation
  • Sewers drainage
  • Aeration system
  • Pump station system

Why Choose Flowspec Luokai

45+ Years Experience

Founded in 1978, manufacturing industrial valves for over four decades with proven reliability worldwide.

Global Certifications

ISO 9001, CE/PED, WRAS, FM, UL, API approved — compliant with international quality and safety standards.

OEM Custom Solutions

Flexible design and manufacturing per your specifications — material, size, pressure, actuation tailored to project needs.

Worldwide Delivery

Exported to 5 continents — North & South America, Europe, Middle East, Southeast Asia, and Africa.

Our Service Promise

Strict Quality Control

Every valve tested to API 598, EN 12266 before shipment

Timely Global Delivery

Reliable logistics to 5 continents with secure packaging

OEM & Custom Design

Tailored material, size, pressure and actuation to your specs

Dedicated After-Sales

Technical support and service throughout product lifecycle

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contactOr give us a email at

sales@lokvalve.com