R.R. Flowmeters Pvt. Ltd offers Diaphragm Meters. The Diaphragm Meters manufactured by R.R. Flowmeters Pvt. Ltd have several diaphragms that capture the fluid as it passes through the meter. Differential pressure across the meter causes one diaphragm to expand and one to contract. A rotating crank mechanism of Diaphragm Meters helps to produce a smooth flow of gas through the meter. This mechanism is connected via gearing to the index, which registers the amount of fluid that passes through the meter.