Tips and tricks for assembly

Pressure test of buried valves

Pressure test of buried valves

HAWLE fittings are manufactured with high precision and accuracy and subjected to ongoing quality control during manufacturing. This qualifies HAWLE to supply the best quality products and provide the unique 10 year HAWLE warranty.

This level of quality is of course contingent on the proper installation. For this reason the pipeline must be subjected to a pressure test after all installations have taken place. The purpose of this test is to prove proper connections of components to all parts of the pipes and to ensure that the pipeline is free from leaks.

Application Note

The pressure test should be performed in accordance with directive EN 805. Make sure that each pipe is covered in such a way that no adverse change in the length or position of the pipe can occur but yet that all pipe connections are still freely available for access and inspection prior to pressure test.

Pipelines connected without proper restraint systems must be adequately secured or anchored at each end, bend and branch. HAWLE strongly recommends that the pressure test is performed prior to filling the entire pipe trench. In the event the pressure test is performed after filling the entire pipe trench, any liability on the part of HAWLE is void except for replacement of the potentially faulty product and all additional excavation and associated costs ensues to the responsible party other than HAWLE.

All products are made for installations intended for potable water, industrial water as well as waste water using pipes made from the following materials Polyethylene (PE), Polyvinylchloride (PVC), cast iron, steel or asbestos cement.

Insertion depth

Insertion depth

To ensure proper function and sealing of the pipe, it is recommended to mark the insertion depth on the pipe prior to inserting the pipe into fittings with socket (SYSTEM 2000, BAIO, VRS / BLS, Hawle-A with Synoflex).

Longitudinal grooves in plastic pipes

Longitudinal grooves in plastic pipes

Polyethylene pipes are soft materials. During storage, transport and manipulation longitudinal grooves can sometimes arise. In the event such grooves are evident, remove the damaged part of the pipe to prevent functional problems with the pipeline connection.

Open or closed position

Body erosion after use in partially open position

Open or closed position

Basically all gate valves, service valves and fire hydrants are to be used in either open or closed position. They may not be operated in partial open position to regulate flow as this can potentially lead to cavitations and thereby destroy the valve.

Professional installation and maintenance

Professional installation and maintenance

Proper assembly and operation of all products are essential. HAWLE recommends using competent people for all installations.

Individual repair of valve with spigot ends

Individual repair of valve with spigot ends

If spigot ends are shortened, protect your investment by applying HAWLE - Repair Material (No. 3441 or No. 3442) onto the uncoated surfaces to prevent corrosion.

Do not install valve upside down

Do not install valve upside down

This avoids unnecessary deposits in the valve housing and associated increase in torque needed to use the product.

Correct assemble of flange prevents leakage

Correct assemble of flange prevents leakage

Cross tighten the bolts by alternating side of the flange in order to prevent leakage and unnecessary stress to the flanges and bolts.

Post assembly of position indicator and actuator

Post assembly of position indicator and actuator

Successive assembly of position indicator or actuator is possible without modification to the HAWLE E2 from models ranging from DN 50 to DN 200. For E2 models in the range DN 250 to DN 600, the centre housing must be replaced with an actuator adapter.

Positioning the extension spindle

Positioning the extension spindle

The extension spindle must be positioned perpendicular to the pipe axis. In Combis the correct position is guided by the supplied assembly aid.

System 2000 connector as slip coupling

System 2000 connector as slip coupling

It is possible to use SYSTEM 2000 connector as a slip coupling. Please note that the stop ring should be removed and the pipe must be sufficiently chamfered.

Pressure build-up due to incorrect hydrant use

Pressure build-up due to incorrect hydrant use

The upstream pipeline valve (2) must never be closed (up to 3m away) prior to closing the hydrant (1), nor should there be a backflow preventer installed in the near proximity. This is because the pressure against the hydrant valve plug would be too high during closing thus causing damage to it and resulting in leakage.