HIDE quality pays off!

Did you know that the unique HIDE winterization solution appears as the
most economical in the market?

HIDE quality pays off!

Did you know that the unique HIDE winterization solution appears as the most economical in the market?
Technical Documention Spare Parts

HIDE – The New Generation G-valves Patent No.: 10-1642210

Why you should select HIDE? What if the ship is listing heavily, with valves in the water zone or even under water and the valves fail? For instance by the float being stuck, damaged or simply gone. Then the valves will take in water! In the worst-case scenario, the pumps could be out of order, due to electrical failure or black-out, or the machinist has evacuated. Then, the situation may rapidly become serious for the ship. The valve’s reliability is of the highest importance, for safety at sea!

What if the valve is slightly too narrow or tight for the air-flow stream? Suction blocking occurs. With a blocked valve, suction forces will create tension in the tank – which might cause a breakdown in the tank’s bulkhead structure. The opposite may also occur: High pressure-drop due to overfilling will force the tank to break down outwardly. Therefore, correct sizing could prevent tank break down!

HIDE quality pays off!

Did you know that the unique HIDE winterization solution appears as the most economical in the market? The 80% savings during installation pays for the entire shipset. In addition, 80% fuel and NOX savings also pays for the entire shipset one more time after only one year in operation.

This position the HIDE quality valves as the most economical and green air vent check valves in the market.

The unique savings are due to a self-regulating heating element, that is optimally located, spending only the necessary power to ensure function. The solution requires 95% less cables, 95% less MCB, and 45kw less generator effect for a shipset of 80 valves.

Unique advantages of HIDE Patent No.: 10-1642210

John Gjerde believe in continuous innovation to improve the safety for the crew, their vessels and for the environment. John Gjerde have solid in-house competence using our own testing facilities for studying the safety aspects of ships.

The unique advantages of the HIDE valve are:

1.  The guiding pin, which ensure perfect performance even under tilted conditions.

2. The unique disc-float shaped for optimal airflow with integrated lip seal gaskets

  • Provides protection against damage from overfilling
  • Provides efficient noise suppression and “clapping” of float
  • Prevents leakage in dipping situations. The disc and pin concept protects the closing mechanism and makes the  G-valve the most reliable valve in the market

3.  The cross-section area inside the valve is larger than the air flow area required by the This decreases the risk of “suction blocking” and structural breakdown.

4.  The flame screen is of robust construction and is re-enforced to prevent breakdown due to water overfill, or debris in water. The screen is large, which minimizes pressure drop.

5.  The shield protects the closing mechanism from airborne pollutants such as dirt and spray painting.

6.  The heating solution for winterization (optional)

  • Ensures proper functioning in icing conditions down to -50°C
  • Is simple, robust and reliable

7.  IECEx approved

8.  Can be ordered in corrosion resistant aluminum, galvanized steel, stainless steel or higher Duplex steel qualities.

9.  Fulfills the important requirements of DNV-GL Ship Rules Pt.3 Ch.3 Sec.6 Openings and closing appliances: I 308, 401, 402, 403 og 404

10.  Approved by all major classification societies:



Heating / Winterization Patent No.: 10-1642210

The heating (winterization) solution is made to ensure the guarding function in icing conditions down to -50 degrees.

  • Self-limiting PTC heating system to ensure enough heat and to minimize power consumption by 80%.
    Turns on at < +5 deg C
  • 80% reduced installation cost, 95% less cables and 95% less MCB /sw board.
  • 80% less power consumption. Reduced by 45kw (80 valves)
  • Arctic operations -50 Celsius
  • IECEx approved
  • ATEX approved
  • All HIDE valves are prepared for installation afterward. No need for further certification.

HIDE – Options:

  • Flame/Bug/Rat screen
  • Heating/Winterization
  • Additional mud chamber preventing mud from entering the valve (See Mud Chamber).
  • Mounting alternatives: Flanged, threaded or welded
  • Painting
  • Vent through superstructure (see Hide 2)
  • Closing device for dry cargo (see Hide 3)
  • Vent through superstructure, self drained (see Hide 6)
  • Can be ordered in galvanized steel, stainless steel or higher Duplex steel qualities