Diaphragm/Cloth Insert

Mechanical diaphragms transfer pressure from one sealed area to another. They consist of a piston that moves within a sealed cylinder. Mechanical diaphragms are essential components of hydraulic and pneumatic systems. The piston may be sealed off by a variety of devices: "O" rings, cups, "V" packing, or others.

Mechanical diaphragms are designed and manufactured for many purposes. Solenoids and pressure switches contain diaphragms that move from one position to another. However, regulators require diaphragms that respond to small changes in differential pressure. These diaphragms must have flexibility, uniform spring rate, and a minimum change in effective area to return to their initial position.

Diaphragms are also used as shock absorbers in dash pots and dampening devices. These diaphragms reduce pressure spikes and smooth out the flow of liquids and gasses. Mechanical diaphragms provide a barrier between liquids and gasses, allowing the pressure of one to regulate that of the other.

Diaphragms are an essential component of pumps, including hand pumps, automobile fuel pumps, and diaphragm air compressors. When an outside mechanical force actuates the diaphragm, it displaces a certain volume of media. Pumps pull the diaphragm alternately in and out. They create a low-pressure area that sucks in liquids or gasses through a one-way valve. When the force on the diaphragm is reversed, this media is pushed out of another one-way valve.

Mechanical diaphragms are constructed from a variety of fabrics, such as silk, cotton, and other natural fibers. They are also manufactured from man-made materials and polymers such as high strength arimids. Mechanical diaphragms are available in many strengths, weaves, and weights.

Fabric inserts and coatings work together to provide flexible strength to mechanical diaphragms. The fabric provides durability while the rubber ensures a reliable seal. Diaphragms can feature elastomeric coatings on one or both sides, depending on the direction of the pressure differential. Coatings are available in a variety of thicknesses, depending on your application.

Hoffmeyer mechanical diaphragms combine SBR rubber with a nylon cloth inserts for temperature resistance, extra thickness, and increased strength. They are less likely to stretch under pressure and last longer than homogenous diaphragms. Hoffmeyer's rubber sheeting delivers maximum conformity and the ability to withstand deformation when used as a mechanical or engine diaphragm.

Hoffmeyer has over 90 years of experience in the industrial supply business. Let our trusted representatives help you find the mechanical diaphragms and cloth inserts you need for your application!