1. A method for producing a pressure pipe of a tractive solenoid for a hydraulic valve, which pressure pipe has a pole piece (31), a nonmagnetic intermediary piece (33), a tubular piece (35), and a stroke limiter (36), and has a receptacle (37) for an armature (38) that cooperates with a tappet (39), characterized in that the nonmagnetic intermediary piece (33) is thermally joined at its ends to the pole piece (31) and the tubular piece (35) in such a way that after the joining, a sliding surface (43) for the armature (38) is formed, and in that the armature (38) is introduced into the receptacle region (37) before the pole piece (31), the intermediate piece (33), and the tubular piece (35) are joined to one another.
2. The method according to claim 1, characterized in that the intermediate piece (33) is welded to the pole piece (31) and the tubular piece (35).
3. The method according to claim 2, characterized in that a capacitor discharge welding process is used.
4. The method according to claim 1, characterized in that the pole piece (31), the intermediate piece (33), and the tubular piece (35) are vertically aligned during the joining process.
5. The method according to claim 1, characterized in that the stroke limiter (36) is thermally joined to the tubular piece (35).
6. The method according to claim 1, characterized in that the stroke limiter (36) and the tubular piece (35) are made of one piece.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A process for producing (Z)-1-phenyl-1-diethylaminocarbonyl-2-aminomethylcyclopropane hydrochloride which comprises a step of reacting (Z)-1-phenyl-1-diethylaminocarbonyl-2-phthalimidomethylcyclopropane in the presence of an organic solvent comprising toluene by contacting said compound with an aqueous methylamine solution having a concentration of from 1 to 25% by weight to obtain (Z)-1-phenyl-1-diethylaminocarbonyl-2-aminomethylcyclopropane and a step of contacting (Z)-1-phenyl-1-diethylaminocarbonyl-2-aminomethylcyclopropane with hydrogen chloride in an organic solvent comprising ethyl acetate and isopropyl alcohol.
2. The process according to claim 1, wherein the organic solvent is the one consisting essentially of ethyl acetate and isopropyl alcohol.
3. The process according to claim 1, wherein weight ratio of ethyl acetate to isopropyl alcohol is 3-20 to 1.
4. The process according to claim 2, wherein weight ratio of ethyl acetate to isopropyl alcohol is 3-20 to 1.
5. The process according to claim 1, wherein the amount of hydrogen chloride is 1 to 2 gram equivalent per 1 gram equivalent of (Z)-1-phenyl-1-diethylaminocarbonyl-2-phthalimidomethylcyclopropane.
6. The process according to claim 1, wherein the concentration of the aqueous methylamine solution is from 10 to 25% by weight.
7. The process according to claim 1, wherein the amount of methylamine is 4 to 20 gram equivalent per one gram equivalent of (Z)-1-phenyl-1-diethylaminocarbonyl-2-phthalimidomethyl cyclopropane.
8. The process according to claim 1, wherein the organic solvent consists essentially of toluene.