The diaphragm—a double diaphragm—separates the pumped fluid from the hydraulic fluid. Thanks to the double diaphragm technology, a signal is generated as soon as one half of the diaphragm is damaged, allowing maintenance work to be initiated as quickly as possible.
If the hydraulic fluid level in the pump cylinder is too low, the make-up mechanism is activated by a plunger from the diaphragm during the suction stroke. In this process, hydraulic fluid is drawn from the make-up reservoir into the pump cylinder to replenish the hydraulic fluid level in the pump cylinder. Once there is sufficient hydraulic fluid in the pump cylinder, the replenishment device is no longer activated.
If the hydraulic fluid level in the pump cylinder is too low, a bore is opened during the suction stroke via a stroke-limiting shaft connected to the diaphragm. This draws hydraulic fluid from the reservoir into the pump cylinder to replenish the hydraulic fluid level in the pump cylinder. Once there is sufficient hydraulic fluid in the pump cylinder, the opening is closed. If there is too much hydraulic fluid in the pump cylinder—for example, due to improper filling—the stroke-limiting shaft opens a passage during the pressure stroke, allowing a small amount of excess hydraulic fluid to be returned to the reservoir.
The relief valve is used to protect the pump against excessive pressure. When the relief valve opens, the hydraulic fluid in the pump cylinder is diverted into the reservoir.
Optical Diaphragm Rupture Indicator:
The optical diaphragm rupture indicator consists of a pressure gauge, a check valve, and a drain valve. In the event of a diaphragm rupture, the check valve maintains the pressure within the indicator.
Diaphragm rupture indicator with pressure switch:
With the electrical diaphragm rupture indicator, it is possible to receive an electrical signal in addition to the visual indication in the event of a diaphragm rupture. This signal can trigger an audible or visual alarm and/or interrupt the power supply to the pump’s drive motor.
The ventilation valve regulates the volume of air injected into the hydraulic unit to dampen pulsations in the pump cylinder.
The electric auxiliary pressure regulator controls the air volume in the hydraulic unit via a vent valve. When a certain pressure is reached, a pressure sensor opens the vent valve, injecting additional air into the pump cylinder. This optimizes pulsation damping under varying operating conditions.
In pumps with suction-side conditions, compressed air is injected into the suction-side pulsation damper via an air injection fitting; this air settles in the suction-side pulsation damper and is partially transferred to the discharge-side pulsation damper.
The air flow meter allows for precise adjustment of the air flow and visual inspection of the air supply valve's operation.
The vent valve is used in pumps with suction conditions. Air is drawn into the suction-side pulsation damper during each suction stroke.
The lifting device makes it easier to replace the diaphragm by allowing the diaphragm housing cover to be hooked onto the device and swung aside.
The pressure gauge shows how much pressure is in the pump.