LPG 4-hole tanks
When it comes to LPG tanks (autogas tanks), there are a number of technical details that need to be taken into account, especially when selecting, installing and replacing them. The following overview explains the most important differences and features. LPG 4-hole tanks for LPG workshops and specialist dealers: As a professional, you can buy LPG 4-hole tanks here. With us, you get everything from a single source: a large product range, effective logistics, plus service and training if required. Over 3000 companies worldwide trust us. So that you have the best offers for your LPG customers. More about our LPG 4 hole range.
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Differences and properties of LPG tanks: LPG withdrawal and tank designs
4-hole LPG tanks have a permanently welded valve plate with separate connections for withdrawal, filling, overpressure protection and level indicator. They are particularly easy to maintain, ECE 67R-01 certified and ideal for private use in motorhomes for heating, cooking and cooling, as well as for commercial applications or use on loading areas. At HybridSupply you will find tested models from STAKO and GZWM in various sizes and designs.
What is an LPG 4-hole tank?
LPG tanks are used as fuel containers for liquefied petroleum gas (LPG ) when converting vehicles to LPG. Autogas tanks are available in different designs and shapes. The main difference between LPG tanks is the valve flange - 1-hole or 4-hole technology. In 4-hole tanks, a steel plate is welded to the tank, which is provided with four small openings in the tank. They can also be used as fuel gas in motorhomes.
Four special valves for the 4-hole tank are inserted into the openings:
- Withdrawal valve
- Pressure relief valve or safety valve
- 80 % fill stop valve
- Gas level indicator with float
With this so-called 4-hole technology, each valve has its own function. In the event of a technical defect, only the respective component needs to be replaced individually. As a rule, 4-hole LPG tanks are significantly more expensive than conventional LPG multivalves. The refueling process is somewhat faster with 4-hole tanks than with multivalves, which can be a useful advantage for tanks with a large filling volume. As a rule, the 4-hole tank does not offer any significant advantages that would justify the price difference to a multivalve tank. Autogas converters often prefer the normal multivalve LPG tank, as fitting the valves to the 4-hole tank is more complex. In addition, 4-hole tanks can be used as fuel gas in motorhomes, which enables flexible use.
How do 4-hole LPG tanks work?
Withdrawal types: liquid vs. gas phase
LPG tanks differ fundamentally in the type of withdrawal:- Liquid phase (at the bottom of the tank): Used for propulsion purposes, for example in cars, trucks or vans. These tanks are intended for engine operation.
- Gas phase (top of the tank): Used in so-called RV propane tanks - for example in motorhomes, delivery vehicles with a cooking or heating function.
A tank is only suitable for one of these extraction types, as the extraction pipe is welded firmly inside the tank - either downwards (liquid) or upwards (gaseous). Conversion is not technically possible.
Types of construction: Cylinder tank and donut tank
There are two basic tank shapes:
- Cylinder tank: Usually elongated, often mounted in the trunk or under the vehicle floor.
- Donut tank (toroidal internal tank): Roundish, sits in the spare wheel well.
The functional difference lies mainly in the removal direction, not in the external structure. The coloring can provide clues (e.g. red = RV propane tank), but is not reliable. It is only technically clear from the type plate or by visually inspecting the interior.
Which LPG 4-hole tanks are available?
4-hole LPG tanks are available as a 4-hole toroidal tank or round tank for installation in the vehicle wheel recess or for external underfloor installation under the vehicle and as an LPG 4-hole Cylindrical LPG tank. The 4-hole cylinder tank can either be installed under the vehicle, on the loading area of a pickup or inside the vehicle. The individual valves of the 4-hole tank are protected against dirt and possible gas leaks by a gas-tight fitting box, which protects the valves from mechanical damage and allows the liquefied gas to escape in a controlled manner in the event of a gas leak. 4-hole LPG tanks for LPG conversions are manufactured by Stako and GZWM.
These tanks are designed for specific applications through the pipe and cannot be converted. They often differ in color, with the RV propane tank usually being red - but not always. For reliable identification, it is advisable to check documents, the type plate or the pipe routing.
Common features (both tank types)
- All valves mounted in a gas-tight fitting box
- Protection against mechanical damage
- Safe escape of the liquid gas in the event of a leak
Advantages of 4-hole technology
- Separate functional parts for maximum safety - legally required components such as pressure relief valve and level indicator are individually accessible
- Easy maintenance & spare parts availability - individual components can be replaced without having to open the tank completely
Flexibility during installation and operation - four connections allow individual positioning and better accessibility
Manufacturer & models at a glance
- STAKO - 4-hole toroidal tanks and 4-hole cylinder tanks
- GZWM - 4-hole toroidal tanks and 4-hole cylinder tanks
Installation & accessories
Installation instructions for workshops - the valve plate is welded, installation of the valves directly on the tank
Compatible accessories - pressure relief valves, refueling valves, level indicators, mounting materials
Service & logistics for trade - large stock, training and support, over 3,000 companies rely on HybridSupply