Hans Jensen Lubricators A/S - 100 years

HJ SIP I Valve

Background

The HJ SIP I Valve is the first valve designed according to the HJ SIP principle. SIP is an abbreviation of ’Swirl Injection Principle’ and refers to the principle of using the scavenging air inside the cylinder to distribute a spray of the lube oil as a thin and even oil film onto the cylinder wall.
Thereby, an optimum distribution of the lube oil is obtained at a minimum lube oil consumption.

Functionality

For each piston stroke of the engine, a small quantity of lube oil is sprayed out of the HJ SIP I 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. The lube oil is sprayed into the engine’s scavenging air swirl, whereby the lube oil is distributed.

Installation

The installation of the HJ SIP I Valves requires that the existing holes in the liners from older valves are modified.
The installation of the valves requires a machining of the cylinders both on the inside and the outside.Therefore, the installation of the HJ SIP I Valve requires pulling of the liners.
 
Please feel free to contact us for further information on the HJ SIP I Valve.
 
Read more about the HJ SIP Valve. Click here

 

Purpose

The HJ SIP I Valve is the first valve designed according to the HJ SIP principle. The HJ SIP principle reduces the necessary quantity of lube oil by delivering the lube oil very close to the top of the cylinder liner, where the wear is usually largest, distributing the oil evenly over the entire surface, where the need for lubrication is largest. 

Construction

The construction of the HJ SIP I 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 passage (5) in the inner part, which also contains the seat for the valve needle (6).
 
The HJ SIP I 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 I Valve opens for pressurized injection through the nozzle (4).
 
The spring force and thereby the opening pressure of the HJ SIP I Valve can be adjusted by means of an adjusting screw (8).The leak oil is led back to the lubricator through the connection (9).
 

Installation

The installation of the HJ SIP I Valve requires that the existing holes in the cylinder liner from non-return valves or accumulator valves are modified. Furthermore, the installation of the HJ SIP I Valves requires machining of the cylinder both on the inside and the outside. Therefore, the installation of the HJ SIP I Valve requires pulling of the liners. 
Please feel free to contact us for further information on the HJ SIP I Valve. 
 
Read more about the HJ SIP Valves. Click here 
 
Read more about the HJ SIP II Valve. Click here 


Read more about the HJ SIP III Valve. Click here

Maintenance interval

The function of the HJ SIP I 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 I 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 I Valve 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 I Valves are sent to Hans Jensen Lubricators A/S for renovation. If it is necessary to renovate an HJ SIP I Valve, please follow the instructions below, describing dismantling and cleaning of the HJ SIP I 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 HJ SIP I Valve thoroughly 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 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 I 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 an 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 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 valve. Adjust the closing pressure (the pressure shown on the manometer while pumping) with the adjusting screw (13) for the HJ SIP I 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 I Valve does not spray or if the pressure is increasing, it may be due to impurities in the HJ SIP I Valve and therefore it will be necessary to dismantle and clean the HJ SIP I Valve. Dismount the cover (16) with the screw (17). The HJ SIP I 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 I Valve.

On this page you can find replies to a number of questions, which we are frequently asked on the HJ SIP I 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.
  • What characterizes the HJ SIP I Valve?
    • The installation of the HJ SIP I Valve requires that the existing holes inside the cylinder liner from older valves are modified. Installation is done by means of two stay bolts. The installation of the HJ SIP I Valves requires a machining of the cylinders both on the inside and the outside. Therefore, the installation of the HJ SIP I Valve requires pulling of the cylinder liner.

  • What is the difference between the HJ SIP I Valve and the HJ SIP III Valve?
    • The two HJ SIP Valves are the same when it comes to design and they are both mounted by means of stay bolts. However, the HJ SIP III Valve is always delivered adopted to the existing valve holes, whereas the HJ SIP I Valve is produced by standard measurements. Therefore, the HJ SIP I Valve is more expensive to mount than the HJ SIP III Valve, as pulling of the liners is required.

  • Is the HJ SIP I Valve better than the HJ SIP II Valve and the HJ SIP III Valve?
    • No, all HJ SIP Valves are based on the same principle and provide the same type of spray.

  • Can the HJ SIP I Valve be applied for retrofit?
    • Yes, it can. However, it requires pulling of the liners at the installation in order to carry out a machining on the inside and the outside of the cylinder liner.

  • When should the HJ SIP I Valve be overhauled?
    • The function of the HJ SIP I Valve should be checked at suitable intervals. We recommend that overhaul is carried out after 12,000-15,000 hours or when the cylinders are overhauled.

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