Damping open-slowly manhole

Hygienic stainless steel 304/316L round manhole cover with stainless steel handle,sight glass and damping system,when open and close the manhole cover,the speed is adjustable.

Application:

Food grade tank manholes are specialized access openings designed for containers,storage tanks,reactors in the food ,beverage,pharmaceutical,and cosmetics industries.

1.Food & Beverage Industry

• Dairy, Milk storage tanks, fermenters (requires steam sterilization capability).  
• Beverages Syrup/blending tanks (acid-resistant gaskets needed).  
• Condiments, Soy sauce/vinegar fermentation tanks (gas-tight design).  

2.Pharmaceutical & Biotech  

• Bioreactors, purified water tanks (must meet ASME BPE sterile standards).  

3.Cosmetics & Chemicals

• Cosmetic ingredient tanks (PTFE seals for oil resistance).

Working princples:

1.Seal design

-Uses food-grade gaskets (silicone, EPDM, or Viton/FPM) to prevent contamination from dust, microbes, or external pollutants.  

2.Hygienic design
  - Smooth internal surface (Ra ≤ 0.8 μm, per GMP standards) to prevent material buildup and allow easy CIP (Clean-in-Place) or SIP (Sterilize-in-Place).  
  - Made of 304/316L stainless steel for corrosion resistance and food compatibility.  

3.Safety Features
  - Pressure balance valves prevent sudden pressure release when opening.  
  - Explosion-proof versions may include rupture discs for overpressure protection

Hygienic tank manway function:
1.Hygiene Maintenance
  - Prevents cross-contamination, ensuring compliance with food safety regulations (e.g., HACCP).  

2.Operational Access 
  - Allows personnel entry for cleaning, inspection, or maintenance (large tanks must follow OSHA confined space regulations).  

3.Material Handling
  - Serves as a temporary filling port, sampling point, or connection for piping/pumping systems.  

4.Safety Control
  - Includes sight glasses or venting ports to monitor tank conditions and prevent vacuum/pressure hazards. 

Specification:

Specifications: 100mm-800mm

Material: 304/1.4301, 316L/1.4404, ASME BPE 316L 1.4435 NB2 Fe≤0.5%

Pressure: vacuum to 10bar (1.0 MPa)

Temperature: -20℃ to +150℃, Depending on the seal material

Sealing: EPDM FKM HNBR PTFE

Finish: Ra≤0.8μm; MP=Ra≤0.6μm; EP=Ra≤0.3μm

Certification: FDA 177.2600; 3A-84-02; Glass II USP Glass VI Chapter 88; GB4806.11; EG VO/1935-2004; PED/97/23/EC;