Sherwood SR 7206 Specifications download pdf (Page 3)

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ANNUAL INSPECTION GUIDELINES

1. Visually inspect the ﬁrst and second stage for signs of damage or deterioration. Mouthpieces with tears or other

damage should be replaced.

2. Retract hose protectors and inspect the hose over its entire length for signs of damage including blisters, deep

cuts or separation at the crimped ﬁttings. If these signs are present the hose must replaced and standard service

overhaul is recommended.

3. Insert a soft probe through the exit port and lift the Exhaust Valve to inspect it for cuts, tears or contaminated

surfaces. Perform this examination from both sides of the Exhaust Cover to observe the entire perimeter of the

Exhaust Valve. If damage to the Exhaust Valve is found a complete overhaul is recommended. If the Exhaust

Valve or the sealing surfaces on the Housing are contaminated with debris, the Exhaust Cover must be removed

and the surfaces must be cleaned. Instructions for removing and replacing the Exhaust Cover appear in

the Disassembly Instructions in this manual. As a ﬁnal check of the Exhaust Valve apply a moderate suction

(approximately minus 5 inches of water, moderate inhalation effort) to the second stage mouthpiece with the air

supply closed and the second stage purged. If leakage is detected a complete overhaul is recommended.

4. Inspect the ﬁrst stage ﬁlter for evidence of contamination. Discolored ﬁlters indicate previous contact with

contaminated air. If evidence of contamination is present it is recommended that a standard service overhaul be

performed. In addition you should advise the customer that the regulator has been exposed to contamination

and that previously used air cylinders used should be inspected.

5. Install an intermediate pressure gauge into one of the available LP ports.

6. Pressurize the regulator to approximately 500 psi and inspect for leakage. If air leakage through the second

stage is detected, it is possible that the second stage Oriﬁce is not in position to create a seal. Close the valve

to stop the air ﬂow and reopen quickly. This will generate enough sudden pressure to move the Oriﬁce to its

proper position. Note intermediate pressure. It should not be greater than 145 psi. If no leakage is detected

increase pressure to 3000 psi. Again check intermediate pressure. It should not exceed 145 psi. The speciﬁed

intermediate pressure for the SR1 is 135+/- 10 psi. If intermediate pressure is out of range or leakage is present

a standard service overhaul is recommended.

7. With the second stage Control Knob set at the least sensitive position (rotated fully clockwise) test the purge

function. If there is not a strong surge of air, a standard overhaul is recommended.

8. Gently submerge the entire regulator and look for bubbles that indicate leakage. If leakage is present a standard

service overhaul is recommended.

9. If a test bench is available perform an inhalation test. With the Control Knob in the most sensitive position

(rotated fully counterclockwise) inhalation effort should not be greater than 2.0 inches of water at opening and

less than 5.0 inches of water at 15 SCFM. If there is a slight leakage of air present refer to Adjustments Section

of this manual and adjust as needed. If adjustment fails to stop the leak a standard overhaul is recommended.

If a test bench is not available perform a subjective breathing test. When properly adjusted the regulator

should provide smooth and easy inhalation. If difﬁculty with inhalation is suspected a standard overhaul is

recommended.

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Sherwood SR 7206 Specifications Page 3