Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.

Adjust the flow rate as needed.

Lock the handle using a padlock.

Set your flow rate and then adjust it as necessary; these valves maintain flow rate despite pressure changes in the system.

Direct flow manually with a lever.

Set a specific pressure and these valves will maintain it by diverting excess fluid to a tank.

Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.

Turn the knob to gradually adjust the amount of flow.

Push or pull the toggle handle to control flow.

To set the pressure, unscrew the cap and turn the adjusting screw.