Pinch Valves for Garnet

A profile cutting shop based in the UK, also carrying out precision machining, welding & fabrication are using AKO’s compact and lightweight plastic Pinch Valve with screwed BSP end connections.

The valve is used on an abrasive feed for a waterjet cutting machine.

pinch valve for waterjet cutting machine
pinch valve for garnet hopper

Application Details

The garnet is passing through the VMP type Pinch Valve at 2 – 2.5 BAR and is ambient temperature. The Pinch Valve is positioned below a hopper, and is installed in the normally open position. It is used to regulate the flow of Garnet to the cutting head. The number of cycles that the Pinch Valve performs per day varies due to the work load. There is no degree of vacuum used within this application, and 6 BAR is being used to shut off the Pinch Valve.

VMP025.03XK.72
Pinch Valve used within this application – VMP025.03X.72

VMP model, air operated, POM body, POM BSP internal thread end connections, natural rubber sleeve.

AKO Advisory

After realising this company’s application details, and noting that they are closing the valve off with 6 BAR., we advised that only 2 – 2.5 BAR above the line pressure is required to fully shut off AKO valves. Since the line pressure of the Garnet is only between 2 – 2.5 BAR, then only 5 BAR maximum should be needed to close the valve. We recommended regulating the closing pressure down, which will help prolong the lifetime of the rubber sleeve slightly.
The company mentioned that the body of the valve periodically becomes worn due to the abrasive flow. Since they are using AKO’s plastic VMP type Pinch Valve, we then offered AKO’s VMC type Pinch Valve – an aluminium bodied valve with stainless steel threaded ends that would be a lot more robust for this particular application and should save the company money in the long run.
Pinch Valves Experience within this Application

The company have been using the VMP plastic Pinch Valve by AKO for 4 years. An AKO Pinch Valve was supplied as a standard fitment with their new waterjet machine and they have maintained it ever since.

Depending on their workload, the rubber sleeve inside the valve is replaced every 4-6 months within this particular application.

The profile cutting company are satisfied with the performance of the Pinch Valve overall, and are going to look into the option of the VMC model which will be more suitable for the abrasive application.