Check Valve Maintenance & Safe Use Instructions

Preface

BATUSAN is committed to your personal safety and long service life of the Check Valve with this instruction manual, Installation and Operation Manual. This Check Valve Maintenance manual will provide all necessary safety guidelines for valves, including information on handling, installation and operation of the valve. Please read it carefully before installing or maintaining the valve.

Purpose

Check valves, also called backstop valves, are a type of valve used to prevent the return of fluids transmitted under pressure in pipe circuits with a decrease in circuit pressure. The opening of the valve depends on the increase of the inlet pressure and the closing of the valve depends on the decrease of the circuit pressure. This simple mechanism is what keeps Check Valve Maintenance light.

In order to fulfill the working principles of the CHECK VALVE, it will be possible to ensure that the valve is assembled in accordance with the conditions of the valve and operated in environments suitable for the conditions of the valve. Correct assembly is the starting point of trouble-free Check Valve Maintenance.

The user is responsible for the problems and consequences arising from behaviors contrary to the specified issues, including those caused by neglected Check Valve Maintenance.

Considerations when selecting a check valve

The Check Valve Maintenance instructions list the following selection criteria:

• The medium in which it will be used (the fluid passing through it) should be selected according to whether the fluid is liquid, gas, air or dark excess fluid containing solid particles and whether it is corrosive or not.
• Concentration and temperature of the fluid (max and min): the max temperature and min temperature of the fluid passing through the operating temperature valve must be known.
• Operating pressure (max operating pressure): max pressure of the fluid passing through the valve.
• Type of connection to the circuit: threaded, flanged, socketed, welded or unionized.
• Size or amount of fluid to be flowed per hour.
• Compliance with world standards TSE, API, DIN, EN.
• Valve passage type: full passage, reduction passage.

Considerations when installing the check valve

Correct installation is the starting point of trouble-free Check Valve Maintenance; observe the requirements below.

For valve connection elements on the installation made

• It must be of suitable standard, pressure class and diameter.
• The axes of the pipes to be installed and the hole axes of the fitting to be used must be on the same axis. Example: if flange is used as connection element, bolt hole axes must be on the same axis. (Excessive stresses occurring on the STRAINER (Filter) due to such axis misalignments will jeopardize the tightness.)
• In flanged connections, bolts suitable for flange holes must be used.
• If the connection element is flange, the gaps are removed by tightening the bolts mutually, then they are tightened mutually at the given torque values.
• If needle valve space is left during installation, it should be left by calculating the length of the Check valf to be used and the length of the sealing elements.
• If the connection type will be threaded, the thread length on the pipe should not be less than the Check Valf thread length.

For check valve assembly sealing element in the installation

Sealing elements are the most frequent item in Check Valve Maintenance:

• Sealing element suitable for fluid type and pressure should be selected.
• The surfaces of the sealing element to be used in flange connections must be smooth.
• De-assembled, deformed sealing element should not be used, a new one should be installed.
• When installing the sealing element, care should be taken not to close the valve passage throat. (Sealing elements Klingerit, Teflon, 0-ring, rubber or rubber of suitable hardness.)

For valve installation in the installation

The Check Valve Maintenance instructions require the line to be clean before the unit goes in:

• Before Check Valve installation, the line must be cleaned with compressed air or steam to remove any burrs, rust, foreign objects and dirt that may be present in the pipeline.
• For the new Check Valve to be installed, the labels / covers on both flanges must be removed.
• The flange side of the Check Valve to be installed in the installation, where the technical information is written, is mounted as the inlet. Then the other side is mounted to the installation without giving the opportunity to create tensile stress.

Points to be considered when using check valve

Day-to-day use directly affects Check Valve Maintenance intervals:

• • Remove the Check Valve from its packaging when you will connect it to the installation.
  • Operating conditions are specified on the sight glass as maximum working pressure in BAR.
  • The filter should be cleaned periodically by removing the blind plug on the STRAINER (Filter) cover.
  • Check Valve Maintenance depends on correct orientation: when connecting the Check Valve to the installation, make sure that the direction arrow is in the direction of flow.

Tools and materials to be used

Check Valve Maintenance requires only a simple tool set: a double-ended wrench, suitable for connecting bolts and nuts.

Connection bolts used in flanges

The Check Valve Maintenance instructions give the following connection bolt dimensions for tailed flanges. L is the bolt length and Ø d the bolt diameter, both in millimetres.

Valve size	PN 16 (DIN 2633 tailed flange) — L	PN 16 — Ø d	PN 40 (DIN 2635 tailed flange) — L	PN 40 — Ø d
DN 10	50	12	50	12
DN 15	50	12	50	12
DN 20	50	12	50	12
DN 25	50	12	50	12
DN 32	50	16	55	16
DN 40	55	16	55	16
DN 50	55	16	60	16
DN 65	55	16	65	16
DN 80	60	16	65	16
DN 100	60	16	75	20
DN 125	65	16	80	24
DN 150	70	20	85	24
DN 200	75	20	90	27

Conclusion

If you want your existing installation to work properly, placing a strainer (filter) in the main circuits will reduce operating costs.

The Check Valve connected to the installation should be operated within the size and working pressure specified on it to prevent possible leaks and operating costs.

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