Abstract: In the vertical die casting device of this invention, the molten metal is poured from the gate into the sleeve with the cavity gate closed by the counter tip; and when filling the cavity with the molten metal, the plunger tip and the counter tip are lowered at the same speed so as not to pressurize the molten metal held between the tips to prevent the temperature reduction of molten metal so that when the counter tip opens the cavity gate with the plunger tip continuing to move down the molten metal can smoothly flow into the cavity.

Abstract: Disclosed is a double feedback loop type of secondary air control system for an internal combustion engine, in which a valve provided in a secondary air feed passage for regulating a quantity of the secondary air fed into an exhaust passage of the engine is operated in response to a first error signal indicative of a deviation of the actual secondary air quantity from the desired secondary air quantity and a second error signal indicative of a deviation of the actual air-fuel ratio from the desired air-fuel ratio, thereby effecting a precise control of the air-fuel ratio.

Abstract: A pressure control device for a vehicle use for controlling the braking fluid pressure in a pair of mutually independent circuits, a first and a second, to deliver the braking force produced in a dual master cylinder, to each wheel cylinder respectively disposed on a pair of rear wheels. This device is provided with an inertia valve disposed in the first circuit, a shut-off valve disposed in the second circuit, and a balance piston which is affected on either end thereof the fluid pressure coming through the inertia valve in the first circuit and the fluid pressure coming through the shut-off valve in the second circuit. The balance piston and the shut-off valve are so combined as the former be operated by the difference of the fluid pressure acting on the both ends thereof to open and close the latter for equalizing the fluid pressure in the second circuit with that in the first circuit, which is under the control of the inertiidalve.