Hans Jensen Lubricators A/S - 100 years

HJ SIP II Valve

Background

The HJ SIP II valve is a development of the HJ SIP system, where focus is on minimising the machining required during installation.

The primary function of the HJ SIP II valve is to deliver a spray of lube oil into the cylinder, which is then distributed by the scavenge air swirl.

The installation process can be expensive and therefore, with the HJ SIP II Valve focus has been put on an optimisation of the installation, especially with regard to performing the necessary cylinder machining in-situ.

Functionality

For each piston stroke of the engine, a small quantity of lube oil is sprayed out of the HJ SIP II valve.

The lube oil is sprayed into the engine’s scavenging air swirl, whereby the lube oil is diffused and an optimum coverage of the top of the cylinder wall is obtained, where the need for lubrication is largest.

Installation

The HJ SIP II valve can be mounted as a replacement for the previous valves from conventional cylinder lubrication or accumulator lubrication and on newbuildings.

The HJ SIP II valve is delivered adapted to the existing valve holes and is easily mounted with a thread integrated on the valve.

However, the installation also requires a minor modification inside the liner, but this can be carried out in-situ and it is not necessary to pull the liners.

This means that the installation of HJ SIP systems has become both cheaper and faster.

Please feel free to contact us for further information on the HJ SIP II Valve. 

Read more about the HJ SIP Valve. Click here

Purpose

HJ SIP Cylinder lubrication reduces the necessary cylinder oil amount by applying the cylinder lube oil close to to the upper liner wall, where the greatest wear takes place, and distributes it evenly on the entire surface, where the need for cylinder lubrication is greatest.

The HJ SIP II valve is a development of the HJ SIP system, where focus is on minimising the cylinder machining necessary on installation.

Construction

The construction of the HJ SIP 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 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 valve opens for pressurized injection through the nozzle (4).
The spring force and thereby the opening pressure of the valve can be adjusted by means of the adjusting screws (8). The leak oil is led back to the lubricator through the connection (9).
After installation, the direction is adjusted by loosening the screws (10) and adjusting the head to the marked position.

Installation

The HJ SIP II valve can be mounted as a replacement for the previous valves from conventional lubrication or accumulator lubrication and on newbuildings. The HJ SIP II valve is delivered adopted to the existing valve holes and is easily mounted with a thread integrated in the valve.

The only necessary modification is machining of a groove inside the liner, which can be carried out in-situ. Thus, it is possible to mount the HJ SIP II valve without pulling the liners. This means that the installation of the HJ SIP II valve has become considerably cheaper, which gives a shorter pay-back time. At the same time, the time required for the installation has been reduced considerably, which means that retrofit can be carried out during one or few port calls.

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

Read more about the HJ SIP Valve. Click here

 

Maintenance interval

The function of the HJ SIP II 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 II valve.

Measuring of leak oil

When a measuring of 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 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 II 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 II Valves are sent to Hans Jensen Lubricators A/S for renovation. If it is necessary to renovate a HJ SIP II Valve, please follow the instructions below, describing dismantling and cleaning of the HJ SIP II 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.
Dismount the circlip of the screws (16) first and afterwards the screws (16) and (15). Remove the ring (5) and the cover (12).
The valve head (2) is carefully lifted.

The adjusting screw (3) and the adjusting bolt (5) can be demounted.

The nozzle (12) and the needle (11) are removed from the valve housing and the packings are removed.

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 (packings can be ordered on item no. 950261).

All parts are lubricated with a thin acid free oil, e.g. SAE15-20 before assembly.
Place the adjusting screw (3) and the adjusting bolt (5) in the tightening bush (2).
Place the tightening bush (2) with the smallest diameter upwards.
Next, place the nozzle (12) with needle (11) on the tightening bush.
Place a cobber packing (9) on the nozzle (12) and push the valve housing (6) over the tightening bush.

Put the ring (4) over the valve housing (6) and tighten the HJ SIP II Valve in the fixing tool (HJL nr. 208607).

The screws (16) are mounted and tightened to 10Nm.

Adjustment and test of valve

The coupling (13) 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 II Valve.

Adjust the closing pressure (the pressure shown on the manometer while pumping) with the adjusting screw (13) for the HJ SIP II 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 II Valve does not spray or if the pressure is increasing, it may be due to impurities in the HJ SIP II Valve, and therefore it will be necessary to dismantle and clean the HJ SIP II Valve.

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

The HJ SIP II 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 II Valve.

On this page you can find replies to a number of questions, which we are frequently asked on the HJ SIP II Valve. 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.

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