Question

Given are four cylinders: \# 1,#2,#3 and \# 4. The relief valve is set for 3,000 psi. A 15 GPM constant displacement pump is used. A solenoid controlled, hydraulic pilot operated, tandem center, 3 position, 4 way Directional Control Valve (DCV) is used. Use the simplified symbol for the DCV.

The following sequence is required for its system design. (NO ELECTRICAL Solutions are allowed to cause the following Sequence of operations). There of course would be ladder logic for the operation of the two solenoids on the DCV, but this is not on TEST 2 . Do not worry about this.

NOTE: All four cylinders are horizontally mounted and are of the same size}.

Extension: (SOL A would be on)
- Cylinder 1 extends first and clamps on deadheading with 1,000 psi maximum.
- Cylinder 2 extends next. It deadheads than
- Cylinder 4 extends than. It deadheads than
- Cylinder 3 extends

Retraction: (SOLB would be on)
- Cylinder 3 retracts first. It deadheads than
- Cylinder 1 retracts next. It deadheads than
- Cylinder 4 retracts. It deadheads than
- Cylinder 2 retracts finally after this.

Design the complete circuit that will do this sequence using sequence valve(s) and pressure reducing valve(s) as needed and label your cylinders. Place appropriate pressure settings next to spring of the valves that you use so that all this will happen. USE COMPLETE AND CORRECT ANSI SYMBOLS. DRAW THE ENTIRE CIRCUIT. LABEL the cylinders 1, 2, 3 and 4 clearly on your drawing.

Answer 1

The student must design a hydraulic circuit that controls the extension and retraction sequence of four cylinders, using a constant displacement pump, a DCV, sequence valves and pressure reducing valves, conforming to ANSI symbols and without using electrical controls.

Step-by-step explanation:

The student is tasked with designing a hydraulic system using ANSI standard symbols for a circuit that involves a sequence of operations for four cylinders. this scenario is relevant to the field of Engineering, specifically fluid mechanics and hydraulic systems. given are four cylinders numbered 1 to 4, a relief valve set at 3,000 psi, a 15 GPM constant displacement pump, and a solenoid controlled hydraulic pilot operated, tandem center, 3 position, 4 way Directional Control Valve (DCV). the cylinders must follow a particular extend and retract sequence determined by the operation of the DCV and the appropriate use of sequence and pressure reducing valves, without relying on electrical solutions commonly used in ladder logic.

Due to the nature of this question, a visual representation, created using engineering drawing tools and following ANSI standard symbols, would be the best solution. The student is provided with a sequence to be followed for the extension and retraction of the cylinders, and must label the components with their correct pressure settings. The resulting design should facilitate the desired sequence using the specified elements and constraints, without an electrical control system.