Hans Jensen Lubricators A/S - 100 years

HJ SIP III Valve

Background

The HJ SIP III valve is the latest variant of the HJ SIP principle. With the HJ SIP principle, the scavenging air swirl inside the cylinder is used to distribute a spray of lube oil in a thin and even layer on the cylinder wall. The aim of the HJ SIP III valve is to be a substitute for non-return valves of a newer date, but it can also be applied on newbuildings. As with the HJ SIP II valve, the focus is on a reduction of the necessary cylinder machining for installation.

Functionality

For each piston stroke of the engine, a small quantity of lube oil is sprayed out of the HJ SIP III valve. The cylinder lube oil is sprayed into the engine’s scavenging air swirl, whereby the lube oil is diffused and an optimum coverage of the cylinder wall is obtained, where the need for lubrication is largest.

Installation

The HJ SIP III valve is delivered adapted to the existing valve holes and is mounted by means of two stay bolts in the cylinder. As with the HJ SIP II valve, only a minor cylinder machining inside is required and the installation can be carried out in-situ. This saves time and costs as it is not necessary to pull the liners. 

Please feel free to contact us for further information on the HJ SIP III valve.

Read more about the HJ SIP valve. Click here 

Read more about the HJ SIP II valve. Click here

 

Background

The HJ SIP III valve is the latest variant of the HJ SIP principle. With the HJ SIP principle, the scavenging air swirl inside the cylinder is used to distribute a spray of lube oil in a thin and even layer onto the cylinder wall. The aim of the HJ SIP III valve is to be a substitute for accumulator and non-return valves of newer date, but it can also be applied on newbuildings. As with the HJ SIP II valve, the focus is on an installation in-situ. 

Construction

The construction of the HJ SIP III valve is according to the same principle as traditional fuel valves. The lube oil is supplied from a pressure tight lubricator through the oil supply pipe, which is connected to the pipe connection (1).

The lube oil is led from here to the space (2) between the valve housing (3) and the nozzle (4).

From there further on to the inclined holes (5) in the inner part, which also contains the seat for the valve needle (6). The HJ SIP III valve is kept closed by means of the spring (7).

When the axial force on the valve needle (6) from the oil pressure exceeds the spring force, the HJ SIP III valve opens for pressurized injection through the nozzle (4) as droplets. The spring force and thereby the opening pressure of the HJ SIP III valve can be adjusted by means of the adjusting screws (8). The leak oil is led back to the lubricator through the connection (9).

Installation

The HJ SIP III valve is delivered adapted to the existing valve holes and is mounted by means of two stay bolts in the cylinder. As with the HJ SIP II valve, only a minor machining of the groove inside the liner is required. This installation can be carried out in-situ, saving time and costs as it is not necessary to pull the liners.

Please feel free to contact us for further information on the HJ SIP III valve.

Read more about the HJ SIP valve. Click here 

Read more about the HJ SIP II valve. Click here

Maintenance interval

The function of the HJ SIP III valve should be checked at appropriate intervals, e.g. when renovating a cylinder, or after 12,000-15,000 operation hours.

We recommend that the spray, the closing pressure and the quantity of leak oil are checked at appropriate intervals, for example every two years.

In addition, we recommend that the distance between the cylinders and the tip of the needle is measured to ensure that wear on the cylinders does not lead to an exposure of the tip of the valve, which may then be damaged by the piston rings.

The distance is specified in the manual for the HJ SIP III valve.

Measuring of leak oil

When a measuring of the leak oil is carried out, it is recommended to dismount the return pipe (26) in the screwed connection (27) and block the return pipe.

The oil flow must be stable before the measuring of the leak oil can be initiated.

Due to relatively small quantities of leak oil, the measuring should be carried out over an appropriate number of hours.

At delivery, the leak oil quantity of the HJ SIP III valves is 15±10 ml/h.

The leaking quantity may be increasing over time and therefore we recommend that the leaking quantity is checked at appropriate intervals, e.g. every two years or when renovating a cylinder.

Dismantling a valve

We recommend that the HJ SIP III valves are sent to Hans Jensen Lubricators A/S for renovation.

If it is necessary to renovate an HJ SIP III valve, please follow the instructions below, describing dismantling and cleaning of the HJ SIP III valve.

It is important that the work is carried out in a clean place.

During the entire dismantling, it is important to be careful not dropping the parts or in any other way soil or damage the parts.

Please clean the valve on the outside with petroleum before dismantling.

Loosen the screws (15) and (17) completely and remove them together with the cover (16). Using your fingers, please remove the unit which consists of regulation for adjusting screw and adjusting screw (13) with adjusting bolt (12).

Place the HJ SIP III Valve in the fixing tool (HJL nr. 980192) and dismount the tightening bush with the special tool (HJL nr. 980191).

Dismount the pointed screw (8) so that the nozzle can be removed from the valve housing (1).

Turn the HJ SIP III valve upside down (with a hand under) with the oil pipe connection downwards so that all parts can slip out of the valve housing (1).

The nozzle can now be pushed out by pressing on the tip of the nozzle with a finger.

Cleaning

Each part is cleaned with petroleum.

The nozzle hole is cleaned with a ø0.3mm drill.

Clean pressurised air is used to blow the units clean.

If the needle inside the nozzle cannot move freely without resistance as it is intended, the needle must be removed and renovated or replaced.

Assembly of valve

During assembly, it is important that the parts are placed in the same position as before the dismantling.

We recommend that all packings are replaced after the dismantling (the manual states which item number can be used for ordering of these).

All parts are lubricated with a thin acid free oil, e.g. SAE15-20 before assembly.

Place the cobber packing (5) in the bottom of the valve housing.

Place the cobber packing (6) onto the nozzle.

Press the complete nozzle (3) with needle (4) and cobber packing (6) into the valve housing with the tip of the nozzle first.

Mount the pointed screw (8) loose, so that the tip guides the groove of the nozzle.

Mount a new o-ring (9) on the tightening bush (7).

Place the HJ SIP III Valve in the fixing tool (HJL nr. 980192) and mount the tightening bush (7) with a spring (10) and spring disc (11) inside the valve housing.

Use the special tool (HJL nr. 980191) for tightening the tightening bush to 70Nm.

Press carefully the adjusting screw (13) with adjusting bolt (12) into the tightening bush (7).

The guide pin in the tightening bush (12) has to fit the groove of the adjusting bolt (12).

Mount a new o-ring (9) on the guide (14) to the adjusting screw (13) and mount the valve housing (1) with the screw (15) and tighten to 10Nm.

Dismount the pointed screw and degrease it with benzene or similar.

Add Loctite 243 or similar to the thread and mount it in the valve housing. 

Adjustment and test of valve

The coupling (18) at the mark P (”Pressure”) is connected to a manual pump unit with hydraulic oil SAE 15-20 – for example an ”HJ Nozzle Test Rig”. The pump unit is connected to a manometer measuring from 0 to 100bar, class 1. The maximum flow for the pump must not exceed corresponding flow from the lubricator (see ”Output diagram” in the manual for the lubricator), approximately 0.4l/h.

Pump with the handle until there is no air left inside the HJ SIP III valve.

Adjust the closing pressure (the pressure shown on the manometer while pumping) with the adjusting screw (13) for the HJ SIP III valve’s closing pressure (usually 37 bar).

By turning “counter clock-wise”, the pressure is increased. By turning “clock-wise”, the pressure is reduced.

If the HJ SIP III valve does not spray or if the pressure is increasing, it may be due to impurities in the HJ SIP III Valve and therefore it will be necessary to dismantle and clean the HJ SIP III Valve.

Mount the cover (16) with the screw (17).

The HJ SIP III valve is now ready to be installed into the cylinder.

Do not forget to check the distance between the tip of the needle and the surface of the cylinder. The distance can be adjusted with conic shims.

Please feel free to contact us for further information on maintenance of the HJ SIP III valve.

On this page you can find replies to a number of questions, which we are frequently asked on HJ SIP III valves. If you find that the replies are incomplete, you are welcome to contact us with a description of your question or problem. We shall then try to help you best possible.

 
Print