Dump Valve kit ISRI

How It Works

The ISRI 6800/337 seat uses a self‑levelling air suspension system that maintains support for the occupant’s weight and optimises comfort and shock absorption. The dump valve is part of this system:

• When pressed or pulled, the dump valve releases the pressure in the air system, allowing air to escape. This causes the seat to deflate or drop to its lowest position.

• This action is especially useful when entering or exiting the seat, as the seat can be lowered to make access easier.

• When the operator sits on the seat after dumping the air and then releases the dump valve, the seat’s automatic suspension will re‑inflate and self‑adjust to the operator’s weight.

This quick release function improves both ergonomics and safety since lowering the seat can make it easier to climb in and out, especially in larger vehicles or trucks.

Where It Fits in the Seat System

The ISRI 6800/337 is a professional air suspension driver seat widely used in trucks, plant equipment, material handling, and other vehicles requiring high comfort and adjustable seating. Some of its key features include:

• Self‑levelling air suspension with weight range accommodating most operators

• Integrated 3‑point safety belt and ergonomic controls

• Adjustable features including tilt, height, backrest angle, lumbar support, and more

• The dump valve is integrated within this pneumatic control system, linked to the seat height/air adjustment mechanism.

The dump valve is a pneumatic control valve — not a mechanical lever like a seat slide — and it works by controlling the air lines that feed the pneumatic suspension. Releasing air via the dump valve lets the seat lower rapidly and completely.

Why It’s Important

1. Easier Access

Dumping the air lowers the seat, making it easier to get in and out, especially for drivers who struggle with tall or elevated seats.

2. Suspension Reset

The dump valve works with the seat’s automatic self‑levelling system, allowing the suspension to reset to the operator’s weight quickly.

3. Simple and Reliable

Compared to complex electrical controls, the dump valve is a simple pneumatic part that is robust, easy to maintain, and inexpensive to replace when worn.

Where It’s Used / Typical Vehicles

The ISRI 6800/337 seat and its dump valve are common in:

• Heavy‑duty trucks (e.g., Scania, Iveco, Mercedes, Freightliner — seats can be fitted or used as replacements)

• Industrial vehicles such as material handling equipment with air‑suspended operator seats

• Plant and construction vehicles that require air‑suspended luxury or heavy‑use seats

Because the 6800/337 seat is a popular model in the ISRI range, the dump valve serves a wide range of applications wherever that model seat is installed.

Maintenance and Replacement

• The dump valve is typically replaced as a standalone service part when the seat no longer releases air properly.

• It is usually a fairly inexpensive component (compared to full seat assemblies) and can be serviced by technicians familiar with pneumatic seat systems.

• For safe maintenance, always refer to the seat’s operator or workshop manual and follow OEM procedures; incorrect servicing of pneumatic systems can affect seat suspension performance.