MECH1330Chapter6Homework

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True/False
Indicate whether the statement is true or false.

Placing a component in parallel with a check valve means fluid has the option of going through either component.

One application of the shift valve is to have a primary pump and secondary pump, which acts as a backup to the primary pump, connected to a system.

A pilot operated DCV is shifted through pressure within the system.

Because standard solenoids don’t have the ability to generate enough force, a pilot-operated FCV is used.

Subplate mounting means there are threaded connections in the valve itself and fittings are screwed directly into the valve, while Inline mounting means the bottom of the valves have unthreaded connections.

Less leakage, less contamination, and smaller propability of doing damage during assembly are some of the advantages subplate mounts have over inline mounting.

If a DCV is operated above its max flow rate, the result will be increased leakage and possible damage to the valve.

Operating a DCV above its maximum pressure rating will most likely result in a large pressure drop across the valve.

The term regenerative is the general term used to describe a system in which the waste is fed back into the system to supplement the input power.

Matching

a.	detented DCV	f.	pilot-to-open check valve
b.	DCV	g.	FCV
c.	spring return DCV	h.	pilot-to-close check valve
d.	PCV	i.	manifold
e.	check valve	j.	cartridge-type valve

10.

The simplest directional control valve; allows flow in one direction but blocks it from the other direction.

11.

Controls the pressure level in a hydraulic circuit, which in turn controls the output force of the cylinder. .

12.

Controls the direction of flow in a hydraulic circuit.

13.

Controls the flow rate of the fluid in the circuity, which in turn controls the speed of the actuator.

14.

Acts as a standard check valve when no pressure is applied to pilot lines, allowing flow in one direction but not the other. When pressure is applied, flow is allowed in both directions.

15.

This type of valve blocks flow in both directions when they recieve pressure to the lines, but operate as a standard check valve when pressure is not applied to the lines.

16.

A valve that is returned to the normal position through the help of a spring.

17.

A valve that has no normal position because it will remain indefinitely in the last position indicated.

18.

This valve is a very compact alternative to the spool type design, and screw directly into a cavity in a manifold.

19.

A subplate that has two connections for two or more valves.

a.	2970 lb, 14,140 lb	d.	4712 N, 29,450 N
b.	72 psi	e.	38 psi, 52 psi
c.	25.46 m/min, 159.2 m/min	f.	653.6 in/min, 3111 in/min

20.

A cylinder with a bore diameter of 3 in and a rod diameter of 1.375 in is to be used in a system with a 20 gpm pump. What are the extension speeds when regenerating and when not regenerating?

21.

A cylinder with a bore diameter of 50 mm and a rod diameter of 20 mm is to be used in a system with a 50 lpm pump. What are the extension speeds when regenerating and when not regenerating?

22.

The cylinder in the problem 11 above is used in a system with a max pressure of 2000 psi. What are the max extension forces when regenerating and when not regenerating?

23.

The cylinder in the problem 12 above is used in a ssytem with a max pressure of 15,000 kPa. What are the max extension forces when regenerating and when not regenerating?

24.

Deteremine the pressure drops across the DCV in example 6-3 when the cylinder is extending (P®A, B®T).

25.

Deteremine the pressure drops across the DCV in example 6-3 when it is in center (P®T, A and B are blocked).