Series SL-V metering devices

For use in single-line lubrication systems

Series SL-V metering devices are for single-line, high-pressure centralized lubrication systems dispensing lubricants compatible with polyurethane seals up to NLGI 2. Output is externally adjustable. An indicator pin permits a visual check of the metering device operation. Individual metering devices can be removed easily for inspection or replacement. Each SL-V metering device includes a clear, polycarbonate protective cap.

Features and Benefits

• Shipped with manifolds from 1 to 6 ports
• Output is externally adjustable
• Clear, polycarbonate-protected cap over indicator pin permits visual check of operation
• Can be removed easily for inspection or replacement
• Output setting system by a set of color-coded sleeves

TECHNICAL DATA

Function principle metering device

Metering quantity: 0,25 to 1,31 cm³0.015 to 0.08 in

Lubricant greases up to NLGI 0, 1, 2

Operating temperature max. +82 °Cmax. +180 °F

Operating pressure: 128-413 bar

typical: 172 bar (1850-6000 psi)

typical: 2500 psi

Relief pressure: 70 bar (1000 psi)

Material carbon steel

Connection main line 3/8 NPTF (F)

Connection outlet1/8 NPTF (F)

Dimensions min. 63 × 222 × 35 mm

max. 203 × 222 × 35 mm

min. 2.5 × 8.7 × 1.4 in

max. 6.1 × 8.7 × 1.4 in

Mounting position: any

Single and manifold type injectors for dispensing fluid lubricants and greases not exceeding Lincoln ventmeter viscosity of 600 psi.

SL-V injector operation

Stage 1

The injector starts in its normal or rest position. Incoming lubricant is directed through the slide valve to both sides of the piston. The pressure of the incoming lubricant acting on both sides of the piston causes the piston to move downward against the shoulder and fills the measuring chamber. The indicator stem is fully retracted away from the stop of the adjusting screw.

Stage 2

A further increase in pressure causes the slide valve to move against the force of the springs. As the slide valve moves, it closes passage 1 and opens passage 2 to the outlet port. The pressure of the incoming lubricant is now acting only upon the bottom of the piston. The incoming lubricant displaces the piston which forces the lubricant in the measuring chamber to be dispensed through passage 2, through the slide valve and through the outlet port to the lube point.

Stage 3

The piston will dispense lubricant until the indicator stem hits the stop of the adjusting screw. The volume of lubricant dispensed can be adjusted by limiting the travel of the piston. The piston and slide valve remains in this position until the lubricant pressure in the supply line is vented.

Stage 4

As the pressure in the supply line vents to 1,000 psi (69 bar), the slide valve moves downward and closes passage 2 and opens passage 1. The lubricant pressure in the supply line is now acting upon both sides of the piston causing it to move downward. As the piston moves downward, a volume of lubricant flows from the underside of the piston, past the slide valve, through passage 1 and to the upper side of the piston. Since the volume on top of the piston is greater than the volume under the piston, an additional volume of lubricant flows from the supply line to the upper side of the piston. This volume of lubricant leaving the supply line causes the pressure to drop very quickly. The piston may or may not fully return to the shoulder, depending upon the volume of lubricant in the supply line. The injector is now ready for the next cycle.