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DN400 Brewery Tank Manhole Stainless Steel 304/316L Tank Manways Circular Sanitary Tank 250mm-600mm Manhole Covers

SS304/316L Sanitary Round Pressure Manway with Sight Glass (DN250-DN600)

Monitor your critical fermentation and processing batches safely without losing tank pressure using the Aomite Sanitary Round Pressure Manway with Built-in Sight Glass.

Designed for top-tier pressure vessels in the brewery, beverage, and pharmaceutical industries, this robust manhole cover allows operators to perform clear visual inspections through the integrated central peep glass. When physical access is required, simply unscrew the heavy-duty handwheels to open the cover.

Advanced Safety Feature: To protect operators from the heavy stainless steel lid slamming shut, our engineered hinge stops and holds the opened manhole cover firmly at 30 degrees beyond the vertical angle. Sealed with FDA 177.2600 compliant gaskets (Silicone, EPDM, NBR, or FPM) and mirror-polished to Ra ≤ 0.8μm, it guarantees absolute hygiene and leak-proof performance under pressure.

Quantity:
Diameter:	400mm
Availability:





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Model:
AMTMH0012

Detail Description

Technical Specifications

Parameter	Specification
Product Type	Sanitary Round Pressure Manhole Cover / Tank Manway
Special Feature	Integrated Central Sight Glass (Peep Glass)
Metal Material	SS304 (1.4301) or SS316L (1.4404) Stainless Steel
Available Sizes	DN250 to DN600 (Featured Model: DN400)
Gasket / Seal Options	Silicone, EPDM, NBR, FPM - FDA 177.2600 Compliant
Internal Surface Finish	Ra ≤ 0.4 ~ 0.8 μm (Mirror Polished)
External Surface Finish	Mirror Polished, Matte, or Sand-blasted
Safety Mechanism	Hinge features a 30° past-vertical safety stop to prevent accidental closing
Locking Mechanism	4 or more heavy-duty handwheels (Quantity scales with size/pressure)

Why should I choose a pressure manway with a built-in sight glass?

Process Monitoring Without Compromising Sterility
In sensitive brewing or pharmaceutical processes, opening the main manhole cover to check the product releases built-up pressure, introduces oxygen, and risks bacterial contamination. A manway with a built-in sight glass allows the operator to shine a flashlight and visually inspect the fermentation activity, foam levels, or cleaning (CIP) effectiveness without ever breaking the tank's seal.

What is the 30-degree safety stop on the manway hinge?

Operator Protection: Large, thick stainless steel covers (like a DN600) are extremely heavy. If a cover is opened straight up (90 degrees), a slight bump or ship vibration could cause it to slam shut like a guillotine.
The Hinge Stop: Our engineered hinge allows the door to swing past the vertical line and physically stops at a 120-degree angle (30 degrees past vertical). Gravity holds it securely in the open position, ensuring safe, unhindered access for maintenance personnel entering the tank.