Diaphragm and diaphragm valve
View Patent ↗The invention relates to a diaphragm for a diaphragm valve. The diaphragm has a functional region and a fastening portion, which surrounds the functional region. In a relaxed state, the functional region includes a central portion, which protrudes on a wet side of the diaphragm; —a lateral portion, which protrudes on a dry side of the diaphragm, the lateral portion being curved, at least in parts, toward the dry side of the diaphragm; and an intermediate portion, which is arranged between the central portion and the lateral portion and is curved, at least in parts, toward the wet side of the diaphragm.
1. A diaphragm valve comprising a valve body, a drive body and a diaphragm, wherein the diaphragm is braced between the valve body and the drive body, and wherein the diaphragm has a functional region and a fastening portion surrounding the functional region, the functional region in a relaxed state comprising:
a. a central portion, which protrudes on a wet side of the diaphragm, wherein the central portion comprises a wet-side sealing web, and wherein the sealing web is surrounded by two recesses in a section view perpendicular to its longitudinal extension;
b. a lateral portion, which protrudes on a dry side of the diaphragm, the lateral portion being curved, at least in parts, toward the dry side of the diaphragm; and
c. an intermediate portion arranged between the central portion and the lateral portion, which is curved, at least in parts, toward the wet side of the diaphragm, wherein a wet-side surface of the intermediate portion is rotationally symmetrical to the positioning axis, wherein the intermediate portion, at least in parts, follows an arc of a circle having a first radius, wherein the lateral portion, at least in parts, follows an arc having a second radius, and wherein the second radius is smaller than the first radius, wherein a ratio of the second radius to the first radius is between 0.40 and 0.85.
2. The diaphragm valve according to claim 1 , wherein the valve body comprises a fastening portion for the diaphragm, a sealing web for cooperation with the functional region of the diaphragm being arranged within the fastening portion of the diaphragm, a sealing contour of the sealing web of the valve body comprising two contact portions which are convexly curved in a longitudinal section of the sealing web and each inwardly abut the fastening portion.
3. The diaphragm according to claim 1 , wherein the first radius is in a range greater than 1/10th of a seat diameter.
4. The diaphragm according to claim 1 , wherein the relaxed state of the diaphragm corresponds to an unloaded intermediate position of the diaphragm, which is between an open position and a closed position.
5. The diaphragm according to claim 1 , wherein a wet-side contour of the intermediate portion is rotationally symmetrical to a positioning axis, and wherein the sealing web transitions into the rotationally symmetrical wet-side contour.