DeZurik APCO SRG-6500 Instruction Manual - Page 8
Browse online or download pdf Instruction Manual for Control Unit DeZurik APCO SRG-6500. DeZurik APCO SRG-6500 11 pages. Surge relief globe valves
DeZURIK
APCO SRG-6500 Surge Relief Globe Valves
Oil Filling Procedure
Recommended Oil: Motor oil SAE 20, "Mobil" DTE 24, "Castrol" Hyspin AW 32
1. With Surge Relief Valve in closed position, open flow control valve.
2. Remove pipe plug located on the side of the oil reservoir.
3. Fill oil reservoir slowly until oil level is flush with the street elbow and then replace pipe plug.
Adjustment of Flow Control Valve
The Flow Control Valve-Figure 1, has a micrometer type adjustment which incorporates a color coded
reference scale to simplify setting, resetting and adjusting.
A set screw on the knob is provided for locking the valve setting. Turning the knob clockwise closes the
valve and turning counterclockwise opens the valve and increases rate of closure of the Check Valve.
Operation of Internal Cushion
As illustrated below, the cushioning of a pneumatic/hydraulic cylinder stroke is obtained by trapping the
exhaust air/oil as the piston assembly nears the end of its stroke. In Figure 2, as the Cushion Plunger
(1) enters Cushion Cavity (2), the exhaust air/oil is almost completely trapped by the Ball Check (3) and
the Adjusting Screw (4) creating a back pressure against Piston Assembly. The back pressure
cushions and slows the final part of the Piston stroke thus, reducing the high impact hammering of the
Piston Assembly against the Cylinder Cap.
Turning the Adjusting Screw to allow more or less air/oil to escape regulates the degree of cushioning
as desired.
In Figure 3, when air/oil enters the Cylinder Cap End to stroke the Piston Assembly in the opposite
direction, the air/oil moves the Ball Check (3) off it seat, opening the passage for more air/oil to act
against the Piston, thus speeding its start-up movement as the Cushion Plunger (1) is immediately
forced out of its cavity (2).
Figure 2 – Cushion "IN" Stroke
D12020
Figure 1 – Flow Control Valve
Page 8
Figure 3 – Cushion "OUT" Stroke
December 2012