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SECTION SEVEN - BASIC CONTROL VALVES
Pressure Control 248-265 Other Center Spools 276
Relief Valves 248-253 Spring Centered Spools 276,277
Direct Acting Relief 249 Spring Offset Spools 277
Pilot Operated Relief 250-253 Detent Spool Position 278
Relief Valve Venting 253 Methods of Direct Actuation 279-290
Unloading Valves 254-257 Manual Actuation 279
Two Pump Unloading 254,255 Mechanical Actuation 280
Accumulator Charging 255-257 Electrical Actuation 281-283
Sequence Valves 257258 Types of Solenoids 282,283
Counterbalance Valves 259-262 Pneumatic Actuation 283,284
Overcenter Valves 260-262 Hydraulic Actuation 284-290
Brake Valves 262-264 Pilot Pressure 285-287
Pressure Reducing Valves 264265 Controlling Spool Speed 288
Direction Control Valves 266-290 Limiting Spool Stroke 289,290
Check Valves 266-269 Flow Control 290-303
Simple Check Valve 267,268 Non-Pressure Compensated 290,291
Restriction Check Valve 268 Pressure Compensated Control 291,292
Pilot-to-Open Check Valve 268,269 Bypass Type Control 293,294
Pilot-to-Close Check Valve 269 Temperature Control 294-296
Sliding Spool Valves 270-278 Sharp Edged Orifice 295
Sliding Spool Graphic Symbols 271-278 Metallic Rod 296
Two & Three Position Spools 273-277 Actuator Speed Control 297-303
Closed Center Spools 274 Meter-in (Restrictor) 297-299
Open Center Spools 274 Meter-in (Bypass) 299,300
Tandem Center Spools 274,275 Meter-out Circuit 300-302
Float Center Spools 275 Bleed-off Circuit 302,303