Built-in valves for hydraulic gear pumps and motors
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for hydraulic gear pumps and motors Anti-cavitation valves l Reduced overall dimensions Maximum pressure relief valves l Simplified plant design Priority valves l Wide choices of ports position "Load sensing" priority valves

BUILT-IN VALVES Anti-cavitation valves, maximum pressure relief valves, priority valves and “load sensing” priority valves built in the following series of gear pumps and motors: For general data, dimensions, drive shafts, mounting flanges and ports, refer to the technical catalogues of each specific series. Hydraulic (>ear Pumps and Motors

Anti-cavitation valves ANTI-CAVITATION VALVES - GENERAL DATA Anti-cavitation valves are housed directly in the rear cover of gear motors. These valves are designed so that the oil circulates through the motor in only one direction, thus protecting against any possible anti-cavitation that may occur each time the system stops. Anti-cavitation valve in unidirectional motors. ♦ In reversible motors, the anti-cavitation valve protects the motor only in one direction of rotation

'A CASAPPA Anti-cavitation valves POLARIS 20, WHISPER 20 - Unidirectional motors (S-D) Order example PLM20*4-S0-03 S1- L OC/OC- N-EL

^ CASAPPA Anti-cavitation valves ^ CASAPPA Anti-cavitation valves ANTI-CAVITATION VALVES - DIMENSIONS POLARIS 20, WHISPER 20 - Reversible motors with rear external drain port (R) Order example PLM20*4-R0-03 S1- L OC/OC- N-EL

'A CASAPPA Anti-cavitation valves POLARIS 20, WHISPER 20 - Reversible motors with side external drain port (L) Order example PLM20*4-L0-03 S1- L OC/OC- N-EL- * 03

^ CASAPPA Anti-cavitation valves POLARIS 20, WHISPER 20 - Reversible motors with internal drain (B) Order example PLM20*4-B0-03 S1- L OC/OC- N-EL

Anti-cavitation valves

Maximum pressure relief valves MAXIMUM PRESSURE RELIEF VALVES - GENERAL DATA The maximum pressure relief valves are housed directly in the rear cover of gear pumps and motors. They are available with fixed or adjustable setting with internal or external drain. These valves are designed to keep the setting pressure constant while protecting the pump or motor against any peaks of pressure. Ø Max. pressure relief valve fixed setting Ø Max. pressure relief valve adjustable setting Built-in anti-cavitation Internal drain. Internal drain. External drain to tank. External drain to tank. u =...

'A CASAPPA Maximum pressure relief valves 'A CASAPPA Maximum pressure relief valves INTERNAL DRAIN FIXED SETTING VALVES - DIMENSIONS POLARIS 20, WHISPER 20 - Unidirectional pumps (S-D) V Bolts tightening torque Order example PLP20*4-S0-03 S1- L OC/OC- N-EL POLARIS 20, WHISPER 20 - Unidirectional motors (S-D) The valve is available for reversible motors with rear (R) and side (L) external drain port to protect the motor in one direction of rotation (CRS for left rotation, CRD for right rotation) Cast iron Order example PLM20*4-S0-03 S1- L OC/OC- N-EL

(3 CASAPPA Maximum pressure relief valves Side drain port bottom position Order example

Maximum pressure relief valves EXTERNAL DRAIN FIXED SETTING VALVES - DIMENSIONS VPEF POLARIS 20, WHISPER 20 - Unidirectional pumps (S-D) T drain port dimensions on page 16 Order example POLARIS 20, WHISPER 20 - Unidirectional motors (S-D) T drain port dimensions on page 16 Order example

(3 CASAPPA Maximum pressure relief valves INTERNAL DRAIN ADJUSTABLE SETTING VALVES - DIMENSIONS POLARIS 20, WHISPER 20 - Unidirectional pumps (S-D) v s’ V Bolts tightening torque Order example PLP20*4-S0-03 S1- L OC/OC- N-EL POLARIS 20, WHISPER 20 - Unidirectional motors (S-D) Cast iron r +0 ~y(i Order example PLM20*4-S0-03 S1- L OC/OC- N-EL

Maximum pressure relief valves INTERNAL DRAIN ADJUSTABLE SETTING VALVES - DIMENSIONS POLARIS 20, WHISPER 20 - Unidirectional pumps (S-D) Left rotation Bolts tightened on Aluminum Cast iron Order example

(3 CASAPPA Maximum pressure relief valves (3 CASAPPA Maximum pressure relief valves EXTERNAL DRAIN ADJUSTABLE SETTING VALVES - DIMENSIONS POLARIS 20, WHISPER 20 - Unidirectional pumps (S-D) T drain port dimensions on page 16 Cast iron Order example

Maximum pressure relief valves PORTS DIMENSIONS GAS STRAIGHT THREAD PORTS British standard pipe parallel (55°) conforms to UNI - ISO 228 SAE STRAIGHT THREAD PORTS SAE J514 American straight thread UNC-UNF 60° conforms to ANSI B 1.1

Priority valves PRIORITY VALVES - GENERAL DATA Casappa offers a wide range of priority valves. They are integrated in the rear cover of pumps to limit overall dimensions and to simplify the hydraulic system. The priority valves control the flow rate and guarantee constant flow (C) to the main circuit regardless of the pressure and pump operating speed. The constant flow rate value is regulated by an internal metering device while the exceeded flow, depending on the type of valve, can be recirculated to the inlet of the pump, to feed other circuits (R) or be sent to the tank (T). Other...

Priority valves PERFORMANCE CURVES Controlled flow vs. inlet flow Each curve has been obtained at: [1] Inlet flow = 6.6 US gpm (25 l/min) [2] Inlet flow = 13.2 US gpm (50 l/min) [3] Inlet flow = 19.8 US gpm (75 l/min) Controlled flow Qc= 2.6 US gpm (20 l/min) Hydraulic oil ISO VG 46 Temperature 122 °F (50 °C)

^ CASAPPA Priority valves ^ CASAPPA Priority valves > Constant flow (C) > Excess flow Internally recirculated. PORTS POSITIONS VALVE WITH SIDE PORT Left rotation Right rotation DIMENSIONS Ports dimensions on page 28

'A CASAPPA Priority valves 'A CASAPPA Priority valves PRIORITY VALVES > Constant flow (C) at > Excess flow controlled pressure Internally recirculated. Max. pressure relief valve adjustable setting with internal recirculation of the drain. Left rotation Right rotation DIMENSIONS Ports dimensions on page 28

^ CASAPPA Priority valves ^ CASAPPA Priority valves PRIORITY VALVES > Excess flow To tank (T). > Constant flow (C) at controlled pressure Max. pressure relief valve adjustable setting with drain connected to tank (T). Left rotation Right rotation DIMENSIONS Ports dimensions on page 28