| 摘要 |
<p>The device has a cylinder rod (25) movable relative to a cylindrical body (20), and a supply duct (26) mounted at a top (25b) of the rod. A piston (28) is slidably guided along the rod, and an elastic compression spring (32) returns the rod and the piston towards a base of the body. A valve (34) is presented at an end of the rod located towards the base of the body. The valve has a head cooperating with a seat arranged in the piston, where the head and the seat are made of a rigid plastic material. An O-ring is placed between a base of the rod and a body of the piston.</p> |
