Fisher Exhaustive Guide for the 9500 Valve Instructions

9500 Valve

Instruction Manual

Form 2433

November 2007

NOSE OR

LEADING

1EDGE OF

DISC

LOCATION OF

FLAT SPOT

ON VALVE

SHAFT 2

OPEN

FLOW

LOCATION OF

INDEX MARK

ON END OF

VALVE SHAFTTAIL OF

1Fishtail

DISC

WITH SPLINED

VALVE SHAFT

1EQUAL MEASUREMENTS BETWEEN VALVE FACE AND DISC EDGE AT TOP AND BOTTOM ENSURE FULLY CLOSED DISC.

2FOR Fishtail DISC, PARTIAL KEYWAY OR FLAT SPOT IS ON SAME SIDE AS NOSE OF DISC.

A2755-1/IL

Figure 2. Valve Shaft Marking

A6017/IL

Figure 3. Partial O-Ring Location

hardware or packing rings, or when loosening the packing box pipe plug.

1.Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the process media from both sides of the valve. If continuous operation is required during inspection or maintenance, install a three-valve bypass around the control valve assembly.

Table 3. Maximum and Minimum Allowable

Mating Flange Diameters

	MAXIMUM AND MINIMUM DIAMETER OF MATING
VALVE			PIPING OR FLANGES
SIZE, NPS		Minimum		Maximum
	mm		Inches	mm	Inches
2	30		1.20	64	2.50
3	64		2.50	92	3.62
4	89		3.50	117	4.62
6	145		5.70	171	6.75
8	196		7.70	222	8.75
10	246		9.70	273	10.75
12	297		11.70	330	13.00

2.Be certain the pipeline flanges are in line with each other and supported.

CAUTION

To avoid damaging valve seating surfaces, make sure the adjacent piping is free of pipe scale, welding slag, and any other damaging material.

3.Inspect the valve body to be sure it is free of foreign material. Make sure the adjacent piping is free of pipe scale, welding slag, and any other material that could damage valve seating surfaces.

4.Measure to be sure the distance between the pipeline flanges is approximately 1/4 inch greater than the valve face-to-face dimension. This will ensure easy installation without distorting the liner (figure 3).

5.For conventional discs, flow may be in either direction; for Fishtail discs, flow must be such that the tail of the disc (as shown in figure 2) will rotate into the downstream side of the valve.

CAUTION

To avoid damaging valve parts, observe the following precautions before inserting the valve in the line.

a.The inside diameter of the mating piping or flanges must be large enough to allow the valve disc to rotate freely into the upstream and downstream piping, or the disc could be damaged. Do not use piping or flanges having an inside diameter smaller than the minimum shown in table 3.

b.The inside of the mating flange must also be small enough to be in full contact with the partial O-rings on the liner faces. Leakage through the flange connections and damage to the liner could

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