Cora Double Valve Gasket

The CORA Double Valve Gasket was conceived to control the dosing as well as packaging of powder product during the filling processes. It consists of a butterfly valve with a central rotor and located on the bottom of machine process outlets driers or bins. This valve was designed to be an automatic and programmable weight system.

How the valve functions:

1. Heavy dosing: The butterfly opens and discharges 95% of the weight. When the bulk weight limit is obtained closes.

2. Fine dosing: When the butterfly closes, the central rotor begins trickle feed until the total weight of the product with an accuracy which varies from ± 20 gr to compliance with the characteristics of a treated product. The fine dosing pockets of the rotor can be numbered and the volume created would be based on customer requirements. The most common application is the continuous liner dosing system, conceived by CO.RA., which allows the discharge of product inside a polyethylene liner as well as the filling of bags in a closed cycle, controlling the weight with more accuracy.

The Cora Double Valve Gasket is a variant of the Double Valve and has a seal between the butterfly and the dosing rotor. This solution allows the valve to work in applications with pressure up to 0.5 bar and with less product leakage during the discharge cycle. Following numerous tests, CORA will certify that it is possible to use this type of valve in environments classified PBOEL 4.

Rotor and Dosing Accuracy:

The dosing accuracy of the DOUBLE VALVE and VALVE GASKET is ± 50 grams with 90% of pharmaceutical products. CO.RA. has found a solution to obtain higher dosing accuracy to meet customer requirements. The solution consists of customizing the volume and number of pockets so it can reach a dosing accuracy of ± 10. In these cases, it is necessary to “fine tune” the process by running tests using the customer’s product. These tests can be carried out using either a DOUBLE or a DOUBLE VALVE GASKET that are available as CORA’s Technology Center.