Shut-Off Guns Models 21250B Series, 21255B, 21280B
Shut-Off Guns Models 21250B Series, 21255B, 21280B
- Various components are listed with their part numbers, descriptions, and quantities required for assembly. Key parts include springs, discharge tubes, inlet tubes, fittings, housings, triggers, pins, valve bodies, and O-rings.
Models
- The document references several models: 21250B Series, 21255B, and 21280B, each with specific parts and assemblies.
Shut-Off Guns
- Different types of guns are mentioned: Corrosion Resistant Non-Weep Guns (21250B-4000-CR), Non-Weep Guns (21250B / 21280B), and Weep Guns (21255B).
Kits
- Kits are available for different models, including items 8, 10, 15-18, and 21. Specific kits are listed for each model.
Disassembly Instructions
- Remove seven self-tapping screws to separate housing halves.
- Drive out hinge pin and remove trigger.
- Remove cap, springs, and ball.
- Remove guide sleeve, control bolt, and O-ring, replacing the O-ring.
- Drive out seats and O-ring from guide sleeve part and replace them.
- Reassemble in reverse order.
Warnings and Cautions
- Do not use acid concentrates through the gun.
- Never secure the shut-off gun in an open position by means other than the operator's hand to avoid bodily harm.
- Always engage the trigger locking mechanism when not in use.
Operating Conditions
- Max Flow: 10 GPM (37.8 l/min)
- Max Pressure: 5000 PSI (345 bar) for 21250B, 21255B; 1500 PSI (103 bar) for 21280B
- Max Temperature: 300°F (149°C)
- Inlet Port: 3/8" FNPT
- Outlet Port: 1/4" FNPT
Contact Information
- Giant Industries, Inc., Toledo, Ohio, with contact details provided for further inquiries.
Catalog excerpts
Shut-Off Guns Corrosion Resistant Non-Weep Guns: 21250B-4000-CR Non-Weep Guns: 21250B / 21280B Weep Guns: 21255B Description Qty Housing, Right Half 1 Housing, Left Half 1 Trigger, 21250B, 21280 1 Trigger, 21255B 1 Pin 1 Valve Body 1 Cam, Trigger 1 Guide Sleeve 1 O-ring 1 Control Bolt 1 Lock, 21250B, 21280 1 Lock, 21255B 1 Cap 1 Valve Spring 1 Valve Ball, 21250B, 21255B 1 Valve Ball, 21250B - 4000 - CR 1 Valve Ball, 21280 1 Valve Seat, 21250B, 21280 1 Valve Seat, 21255B 1 O-ring 2 Self Tapping Screw 7 Description Qty Spring 1 Discharge Tube/Fitting Assy. 1 Inlet Tube 1 Inlet Fitting 1 Inlet Tube and Fitting (21250B, 21255B, 21280B) 1 Inlet Tube and Fitting, 303 S.S. (21250B-4000 CR only) 1 Lock Pin 1 **Sold as an assembly - part number 21001 Sold as an assembly - part number 21001B
Open the catalog to page 1
INSTALLATION & OPERATING INSTRUCTIONS OPERATING CONDITIONS DISASSEMBLY OF THE 21200 SERIES 1) Remove the seven self tapping screws (item #19) that secure the two halves of the housing together. Remove housings (items #1 and #2). 2) Drive out hinge pin (item #4) and remove trigger (item #3). 3) Remove the cap (item #13), springs (items #21 and #15), and ball (item #16). 4) Remove the guide sleeve (item #7), control bolt (item #10) and o-ring (item #8). Replace o-ring. 5) With a small dowel rod, drive-out the seats (#5) & o-ring (#18) from the guide sleeve part. Replace with new seat & o-ring....
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