Flow-rate controller

A liquid flow-rate controller made in the form of a casing with the main inlet and outlet branch pipes comprising:

• a stationary front guide bush with front orifices and a lateral partition limiting the internal space of said bush to form an inlet space communicating directly with the main branch pipe;
• a sleeve arranged coaxially with said front guide bush and caused by a mechanically connected actuator to slide ever and along it with a possibility of covering the front orifices;
• a stationary rear guide bush located in line with the front guide bush and having outlet orifices in its walls;
• a piston-type slide valve with skirt arranged between said lateral partition and said rear guide bush to form a piston space limited by said lateral partition, the piston being spring-loaded on the side of the rear guide bush and capable of making contact with said lateral partition;
• a passage space formed between the casing and said front and rear guide bushes whereby the inlet space communicates with the outlet branch pipe via the front and outlet orifices, a plurality of holes in the aforesaid piston skirt enabling a skirt cavity to communicate with said passage space, and the rear portion of the skirt being fitted freely on the rear guide bush with a possibility of covering the latter's outlet orifices;
• a nonreturn valve and a throttle adjuster arranged in a channel connecting said inlet space with said passage space;
• and an additional inlet branch pipe arranged in the front portion of said casing and connected to said inlet space through a plurality of inlet holes in said front guide bush fitted in a controllable sleeve, said nonreturn valve being mounted in said main inlet branch pipe on the side of said inlet space, and said lateral partition being provided with holes to connect said inlet space with said piston space.