ifp ch. no. 2 hydraulic valves, actuators and accessories (2)

Subject:- Industrial Fluid Power (IFP)CHAPTER NO: 02

HYDRAULIC VALVES, ACTUATORS AND ACCESSORIES (24 Marks (18)

BY

Prof. Kokare A.Y.

BABASAHEB PHADTARE POLYTECHNICKALAMB-WALCHANDNAGAR.

B.P.P. Kalamb-Walchandnagar Prof. Kokare A.Y.

a) According to function: 1. Pressure control valves:

Relief valve Reducing valve Unloading valveCounter balanced valve Sequence valve .

2. Direction control valve:check valve 2/2 valve 3/2 valve 4/2 valve

4/3 valve 5/2 valve. 3. Flow control valve :

Fixed restriction FCV Variable restriction FCVFCV with Reverse free flow Pressure compensated

valveTemperature compensated valve Cam operated FCV


b) According to the method actuation: 1. Manual operated:

Palm operated Push button operated Hand lever operated. Foot pedal operated Cam(roller) operated 2. Pilot operated:

a.Single pilot b.Double pilot. 3. Solenoid operated:

Single solenoid Double solenoid.c) According to construction: 1. Poppet type: Ball type, conical poppet type. 2. Spool type: Sliding spool type, rotary spool type. 3. Flow control : Gate valve, plug valve, needle valve, poppet

valve, butterfly valve etc.


1. Flow rate of oil.2. Pressure of oil.3. Force required by cylinder.4. Speed of operation of cylinder5. Type of actuation of the valve. 6. Port size.7. Space requirement. 8. Temperature of oil 9. Oil under pressure compatibility.10.Environment conditions.


Pressure Relief Valve Pressure Reducing Valve


Pressure Relief Valves.mp4

Pressure Reducing Valve- Pilot Operated.mp4

Comparison between Pressure Relief Valve and Pressure Reducing Valve


Unloading Valve


Unloading Valve Basics.mp4

Comparison between Pressure Relief Valve and Unloading Valve


Counter Balance Valve Sequence Valve


a) According to the method actuation: 1. Manual operated:

Palm operated Push button operated Hand lever operated. Foot pedal operated Cam(roller)

operated 2. Pilot operated:

a.Single pilot b.Double pilot. 3. Solenoid operated:

Single solenoid Double solenoid. b) According to ype of spool: 1. Poppet type. 2. Sliding Spool type. 3. Rotary spool type.a)According to number of ports and position:

check valve 2/2 valve 3/2 valve 4/2 valve4/3 valve 5/2 valve.


Check Valve


Check Valve Animation.mp4

Sliding Spool type 2/2 DCV

Rotary Spool type 2/2 DCV


2/2 Direction Control Valve





using a 3 2 valve NO to control a cylinder.mp4





4-2 Directional control valve.mp4 rotary spool directional valves work.mp4





4-3 Directional control valve.mp4





5 2 valve .mp4

Method of Actuation and there Symbol


Variable Restriction FCV FCV with Reverse Free Flow


Flow Control Valve

Fixed Restriction FCV

Flow control valves work.mp4

Pressure & Temp. Compensated FCV Cam operated FCV with

integral check valve


Pressure Compensated Valve - Part 2.mp4

Camshaft _ Valve Animation .mp4

1.Time Delay Valve 2. Shuttle Valve


Special Type Valves

Shuttle valve .mp4

3.Twin Pressure Valve 4. Pilot Operated check valve (Open & Closed)


Special Type Valves

Pilot Operated Relief Valve Animation.mp4

3/2 Poppet type Direction Control Valve

Comparison


Classification of Actuators

2. Rotating Cylinder


Single acting cylinder Double acting cylinder


Single Acting Cylinder.mp4Double Acting Cylinder.mp4

Diaphragm cylinder Double rod end cylinder


Diaphragm Cylinder.mp4

Tandem cylinder Cylinder with cushioning


Tandem Cylinder .mp4

Telescope cylinder Cylinder Mountings


Telescopic cylinder 2.mp4

A) Vane type B) Piston type (Rack and pinion type


Rotary Actuators

Piston type Actuator.mp4Vane Actuator.wmv.mp4

External Gear Motor Radial Piston Motor


EXTERNAL GEAR PUMP.mp4 Internal Gear Pump.3gp

Gerotor Motor Vane type Motor


Gerotor Operation.mp4

Axial Piston Motor


SWASH PLATE PISTON PUMP .mp4

Flexible Hose


a) Rigid pipe: Cast iron, Low carbon steel, Alloy steels, stainless steel, Copper and its alloy, Aluminum and its alloy. b) Flexible hoses : Nylon braided hoses, steel wire reinforced rubber hoses, poly-urethene tubes, Nylon tubes, polyethylene tubes, PVC tubes, polypropylene etc.a)According to strength:

Standard pipe (STD), Extra strong pipe(XS), Double Extra strong Pipe (XXS).


Flare-Less type fitting (Ferrule fitting)


a) According to method of sealing: 1. Positive seal: perfect seal, 100 % leak proof. 2. Non- positive seal: allow small amount of leakage.b) According to application: 1. Steel seal : used between mating parts having no relative motion. E.g. sealing between flange, gasket etc. 2. Dynamic seal: used between mating parts with relative motion.E.g. rotary motion seal between pump shaft and casing.a)According to shape configuration:

O-ring, quad-ring, T-ring, V-ring, U-cap, Hat ring etc.

B.P.P. Kalamb-Walchandnagar Prof.

Kokare A.Y.

Following are the reason for failure of hydraulic seals.Excessive heat.Excessive load.Excessive clearance.Excessive pressure.Improper fitting.Improper groove gravity.Improper filter rating.Contamination of fluid.Idle storage of sealsAge hardening.Abrasion.


A) Dead weight accumulator

B) Spring loaded accumulator


Classification of accumulators:

C) Separator type accumulator


Accumulators: Circuit

A) Single acting Booster B) Double acting Booster


Pressure Boosters:

Thank youThank you


ifp ch. no. 2 hydraulic valves, actuators and accessories (2)

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