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Hydraulic

Ultrasonic Position Sensing Clamps
Double Acting Work Supports
- Top Flange
- Position Sensing
  - Top Flange PS
Work Supports
- High Capacity Fluid Advance
- Part Present Sensing
- 20,000 lb. Air & Spring
- Air Advance
- Spring Advance
- Fluid Advance
TuffCam™ Swing Clamps
- Threaded Body
- Top Flange
- Top Flange Long Stroke
- Bottom Flange
- Bottom Flange Long Stroke
- Cartridge
- Rod Position Sensing System
- Magnetic Position Sensing System
- TuffCam Low Profile Top Flange
- TuffCam Low Profile Bottom Flange
- TuffCam Low Profile Rod Position Sensing
- TuffCam Low Profile Magnetic Position Sensing
VersaCam™ Swing Clamps (Standard)
- Threaded
- Long Stroke
- Flow Control
- Top Flange
- Bottom Flange
- Cartridge
Swing Clamp Arms
- Standard Arms
- Rocker Arms
- Low Profile Arms
Link Clamps
- TuffLink ™ 360˚
- High Pressure
- Low Pressure
- Levers
Special Use Clamps
- Centering Clamps
- Part Crowder
- ID Expansion Clamps
- Power Pin Part Crowder
- Pull-Down Clamps
- Edge Clamps
- Retract Clamps
- Collet Vises
  - 5-C Collet Vise
  - Air Collet Vise
Cylinders
- Block Body Pull Cylinder
- Threaded Mini
- Threaded
- Block
- Manifold Block
- Hollow Rod
- Cartridge Mount Mini
- Cartridge Mount Push/Pull Cylinder
- Slip-in Cartridge Pull Cylinders
- Easy Mount Cylinder
Push/Pull Cylinders
- Threaded
- Top Flange
- Bottom Flange
- Cartridge Mount
- Block Pull Cylinder
Fittings
Rotary Unions
- HDX Heavy Duty Rotary Union
- Single Path
- Dual Path
- Quad Path
- 6 Path
- 8 Path
- 12 Path
- Rotary Union Arm
Misc. Plumbing
- Manifolds
- Hoses and Tubing
Power Supplies
- Compact Air/Hydraulic Booster
- Booster with Control Package
- Air/Hydraulic Pump
- 1/3 HP Electric Pump
- 1-HP Advanced Workholding Pump
- 2-HP Advanced Workholding Pump
- 2-HP Low Pressure Advanced Workholding Pump
- Advanced Automation Workholding Pump (HMI)
- Advanced Automation Workholding Pump (Okuma)
- Advanced Workholding Pump Cart
- Screw Pumps
- Compact Air/Hydraulic Pump
- Fixture Test Pump
Pallet Fixture Accessories
- Auto-coupler
- Accumulators
- Automatic Shutoff Valve Decouplers
- Manual Shutoff Valve Decouplers
- Tombstone Top Plates
- Thread-in Coupling Element
- Guardian Pallet Monitoring
- Guardian 2.0
Hardware
- Mounting Hardware
- Swing/Link Clamp Spacers
- End Effectors
- Dura Pin Part Crowder
- Fixture Components
Accessory Valves
- In The Port Sequence Valves
- Air Sensing Control Kit
- Filter Plate
- In-Port Flow Control Valves
- In-Line Flow Control Valve
- Shutoff Valve
- Check Valves
- Filters
- Unclamp Delay Valve
- Sequence Valves
- Sequence/PRV Combination
- Pressure Limiting Valves
- Pressure Reducing Valves
- Low-High Valve
- Alternating Valve
- Pressure Switch
- Over Pressure Relief Cartridge
- Pressure Gauges
- Pneumatic Confirmation Valve
Directional Control Valves
- 2 Position / 3 Port
- 3 Position / 4 Port
- Manual Valve Handle Kit
- Valve Subplates
Zero-Point Systems
- Hydraulic Modules
- Hydraulic Modules, Automation
- Hydraulic Modules, Center Lock
- Pneumatic Modules
- Pneumatic Modules, Single Acting
- Pneumatic Modules, Automation
- Pull-studs
- Engagement Screws
Concepts / Applications
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Hydraulic

"A-B" Check

Home > Products > Hydraulic > Accessory Valves > Check Valves > "A-B" Check
A-B Check Valves (PDF 369.00 KB)

Features

"A-B" Check Valve

Model No. 70-3311-12

Sealed pilot piston eliminates cross circuit leakage
5:1 Ratio of Piot to Check pressure for release
Filters on each port location
Manifold mountable
BHC™ body and stainless steel internal components for corrosion protection
5000 psi maximum operating pressure

NOTE: Pressure applied to the "A" inlet port flows to the "A" outlet port and unlocks check on the "B" side allowing pressure on "B" to return to tank. Pressure applied to "B" inlet flows to "B" outlet and unlocks check on "A" side allowing pressure on "A" to return to tank.

Dimensions

"A-B" Check Valve

Dimensions

For proper sealing, mating surface must be flat within 0.003 with a maximum 63 µin R_a surface finish.

All dimensions are in inches.

Mounting Dimensions

"A-B" Check Valve

Mounting Dimensions

All dimensions are in inches.

FeaturesDimensionsMounting Dimensions

"A-B" Check Valve

Model No. 70-3311-12

Sealed pilot piston eliminates cross circuit leakage
5:1 Ratio of Piot to Check pressure for release
Filters on each port location
Manifold mountable
BHC™ body and stainless steel internal components for corrosion protection
5000 psi maximum operating pressure

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Hydraulic

Hydraulic

"A-B" Check

"A-B" Check Valve

"A-B" Check Valve

For proper sealing, mating surface must be flat within 0.003 with a maximum 63 µin Ra surface finish.

"A-B" Check Valve

For proper sealing, mating surface must be flat within 0.003 with a maximum 63 µin R_a surface finish.