JPS605870A - Valve - Google Patents

Abstract

PURPOSE:To obtain a valve having superior cavitation erosion resistance by diffusing an Ni layer formed on at least the surface of the valve seat of a Ti or Ti alloy valve. CONSTITUTION:An Ni layer of about 60mum thickness formed by vapor deposition, electroless plating or other method on at least the surface of the valve seat of a valve made of Ti or a Ti alloy contg. >= about 50wt%, preferably >=80% Ti is diffused by heating to obtain a valve having superior cavitation erosion resistance and suitable for use in an analyzing line or the like in a chemical plant or a power plant. By vapor-depositing Si, Cr, B or the like together with Ni, the m.p. of the resulting layer can be dropped to facilitate diffusion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a valve used in an analysis line for solution or steam management in chemical plants, power plants, etc.

[Technical 717L of the invention] What problems] Generally, when managing solutions or steam in chemical plans 1~ or power generation plants, analysis lines are installed in various places in the room. ing.

The valves used in this analytical line are required to have high corrosion resistance (1.
1 is used. However, Ti does not have sufficient cavitation and erosion resistance required as a valve seat material, and a material that simultaneously satisfies these properties is desired.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a valve having excellent cavidation resistance and better cavitation properties.

[Summary of the Invention] The present invention is characterized by providing an IM jfj that has excellent corrosion resistance and avoids diffusion of the installed N1 layer by vapor deposition, electroless plating, etc. on at least the valve seat surface of the -I valve. It's a valve. The valve base material used in the present invention may contain 1-in: or -1'i in an amount of 50% by weight or more, preferably 80% by weight or more. Ni to T
The reason for not diffusing into Ni is to improve cavidation resistance and 10-dimine properties by preventing the formation of all intercalation compounds of Ni and C through this expansion.

It is also possible to deposit Si, Cr, B, etc. together with Ni to lower the melting point and facilitate -C diffusion.

[Embodiment of the invention] -1-1 Ni on the surface of the valve J3 about 60 tlm
After depositing N1, a diffusion treatment between 1150"C150 and 1150" was performed.As shown in Figure 11 (a), cavitation 1 was applied so that the surface on which N1 was deposited was on the surface of the test piece. 1-John test a J'l was manufactured.Meanwhile, test 1 Jv as shown in Figure 1 (tl) was manufactured from the conventional T1 valve. cavitation i ll-1-diP]
A test was conducted. In addition, the test strip A'1 has an amplitude of 90 μm1
The experiment was conducted for 3 hours at a frequency of 6°5KH2.

As a result, Ni according to the present invention was expanded;
In contrast to the conventional ゛``1 test JV, there were 48
mg and about 3 (t'j Preliminary 1 (1 wear j? (-(-6 Uri, J+i; After depositing N1 according to the present invention on the surface of King 1, J+i; Cavitation resistance of the defeated surface 1) -John 4 No. 1
The valve according to the present invention can withstand long-term use and is useful in industry.

In addition, in the valve according to the present invention, after N1 is vapor-deposited only on the valve seat surface where resistance to cracking and erosion is most required, it is better to avoid expansion 11-Ct).

1- 60μn1 electroless Y on the surface of the i-based alloy pulp
After rCNi plating, a diffusion treatment was performed at 900°C for 20 hours in Ar gas. Thereafter, as shown in FIG. 1(a), a cavidation 11-1-jin nl (Ilj') piece was fabricated so that the Ni-plated surface was the surface of the test piece. (IJ) 4g test C was manufactured from a conventional T-i valve.

These test pieces were subjected to cavitation and
An erosion test was conducted.

The test conditions were an amplitude of 90μm and a frequency of 6.5Kllz.
It lasted for 3 hours. .

As a result, the non-trilysis Ni plating according to the present invention was performed.1. :
Test change cavitation/engineering [L-John 10 wear +1
was 17 m (J, whereas the conventional]゛i test piece-
C is /'1.8111U, which is about 3' fFj more than the wear amount, and the one diffused after electroless Ni plating on the Ti surface according to the present invention is full of cavidation resistance and erosion fl. The valve according to the present invention has a long length]”73
It withstands long-term use and is suitable for commercial use.

In addition, the valve according to the present invention is a valve that is most required to have cavidation resistance and engineering properties.
1 Uno I no electric F + 7Ni Metsu: 1-S then expand (1
Even if it's bad.

1 Effect of light" As is clear from the above results, 1 is effective for bulbs that are exposed to light, and 1 is effective for anti-kissing A7 beersion - ■ - lotion properties (Ωre - (13). This is Saru Ib.

[Brief explanation of the drawing]

Figure 1 is the KiV Hideshi 31n/Sat 11-J]n test! !
? The 1゛O1 plane view (1) of iJ'+ is N i 11j,
tt! : l;”i, (2) has 11. Agent Patent attorney m Near u(((i (idiot name) Fig. 1 (1<b)

Claims (1)

[Claims] A valve characterized in that the Ni layer provided on the surface of the valve seat is diffused by at least [1] or a Ti alloy.