Directional spool valve type SG and SP Product documentation Single valve for pipe connection or manifold mounting Operating pressure pmax: Flow rate Qmax:

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Overview of directional spool valves type SG and SP Directional spool valves are a type of directional valve. They control the direction of movement and the velocity of single and double-acting hydraulic consumers. The directional spool valve type SG is available as a single valve for pipe connection. Type SP is available as a manifold mounting valve. Due to its robust design, operating pressures up to 400 bar are achievable. They are exible in use and are available with various different circuit symbols and types of actuation. Intended applications include mobile hydraulics, in particular in...

Available versions 2.4 "Actuation" 2.3 "Pressure-limiting valve (only type SG)" 2.2 "Circuit symbol" 2.1 "Basic type and size" 2.1 Basic type and size Type Flow rate Qmax (lpm) R Pressure pmax (bar) at port P, A, B Circuit symbol Single valve for pipe connection SG 0 Single valve for manifold mounting SP 1 DAMAGE * Ports for a single valve for manifold mounting see Chapter 4.2, "Single valve for manifold mounting, type SP" ** The maximum return pressure is dependent on the pressure-limiting valve and actuation. see Chapter 2.3, "Pressure-limiting valve (only type SG)" see Chapter 2.4.1, "Manual...

2.2 Circuit symbol Coding Circuit symbol 4/3 or 3/3 directional spool valve for parallel circuit G Only for size 1, 2, 3, 5 With SG 1 not for use in conjunction with a pressure-limiting valve 4/2 or 3/2 directional spool valve for parallel circuit Coding R, V: ■ With SG 1 not for use in conjunction with a pressure-limiting valve Negative overlap (slight oating position between the two switching positions) Only for size 2, 3, 5 Only for size 2 Not for use in conjunction with a pressure-limiting valve For coding V and Q the port R must be connected to the tank in order to drain away the leakage...

Circuit symbol 4/3 or 3/3 directional spool valve for series or parallel circuit. Not for use in conjunction with a pressure-limiting valve in a series circuit. Coding L: ■ With SG 0 and SG 5 not for use in conjunction with a pressure-limiting valve Special version to avoid decompression surges Only for SG 5, not for use in conjunction with a pressure-limiting valve L LS Only for size 0, 1, 2, 3 With SG 0 not for use in conjunction with a pressure-limiting valve Only for SG 3 Not for use in conjunction with a pressure-limiting valve Only possible for SG 2 in conjunction with a pressure-limiting...

2.3 Pressure-limiting valve (only type SG) Coding Without coding Without pressure-limiting valve Pressure-limiting valve for SG 0, 1 Zinc die-cast spring housing, pmax at port R = 20 bar ■ ■ Circuit symbol - Pressure-limiting valve for SG 2, 3, 5 Zinc die-cast spring housing, pmax at port R = 20 bar ■ ■ Pressure-limiting valve for SG 2, 3, 5 Steel spring housing pmax at port R > 20 bar (proof against pressure surges to 300 bar) ■ ■ Special version for special installations and marine applications DAMAGE The pressure in R is additional to the pressure setting. DAMAGE The version with the pressure-limiting...

2.4 Actuation 2.4.1 Manual actuation Coding Manual operation with spring return ■ ■ Circuit symbol AK: Standard version AKS: Special version with a corrosion-resistant steel shaft. Especially for maritime applications. For size 2, 3, 5 the lever housing has an additional at grease nipple. Actuation supplement 1: without hand lever CK, CKS CK1, CKS1 Manual operation with 3-stage detent ■ ■ CK: Standard version CKS: Special version with a corrosion-resistant steel shaft. Especially for maritime applications. For size 2, 3, 5 the lever housing has an additional at grease nipple. Actuation supplement...

Size 0, 1 The switch is not pressed in the spool valve neutral position, for 3/3 directional spool valves it is also pressed in position a. Normally open contact (blue) N/C contact (grey) Input (black) 3/3 directional spool valve (Contact switch functions in positions a and b) The cam is symmetrical. The switch can be adjusted on the switch retainer in such a way that, in switching positions a or b, the contact bridge 11-12 can be used as a normally open contact or 23-24 can be used as a N/C contact, as required (switch is pressed in position 0). (Contact switch functions in position a) The cam...

2.4.3 Mechanical actuation Coding Circuit symbol Roller head actuation – Only for parallel circuit – Only for 4/2 or 3/2 directional spool valve Ball head actuation ■ – Only for size 2, 3 and 5 – Only for parallel circuit – Only for 4/2 or 3/2 directional spool valve Roller head actuation: For lateral actuation by a cam or a control rod, a hardened plunger must have a roller bearing roller at its outer end. The plunger is installed in a ange housing with anti-twist protection, and is tted with a strong return spring. Ball head actuation: For the axial direction of actuation the outer end is...

Actuation diagram Roller head Ball head Switching travel Spring force for spool valve size 0, 1 Spring force for spool valve size 2, 3, 5 Overall actuation force (N) for spool valve size 0, 1: Fges = F + 2.8 pR for spool valve size 2, 3, 5 (4): Fges = F + 5 pR F (N) = see actuation diagram pR (bar) = pressure at port R (reux) Roller head actuation is preferred when actuation is by a cam or a control rod. The actuation curve should be congured and adjusted at assembly against the spool valve so that the spool stroke of the roller head is not pushed beyond the actuation path (3) from the 0 position...