CON-2
Page 40
XV.
Conversion of Type 1900 Flanged Safety Relief Valves
From Conventional to Bellows Type, and Vice Versa
A. General Information
Consolidated
®
Type 1900 Flanged Safety Relief
Valves can be readily converted from
conventional to bellows style, or vice versa, in
the customer's repair shops. However, the
Type 1901 and 1902 valves were constructed
in the conventional type only. Table 16, below,
shows the parts necessary for the typical
conversion.
NOTE:
With regard to all bellows valves, the bonnet vent
plug must be removed and the bonnet vented to a
safe area.
NEW PARTS TO CONVERT FROM
CONVENTIONAL TO BELLOWS VALVE
BELLOWS TO CONVENTIONAL VALVE
1.
Bellows Assembly - Standard Material, AISI
316L Stainless Steel
2.
Set of gaskets for bellows valve.
3.
Guide for bellows valve.
4.
Disc holder for bellows valve.
5.
Spindle for bellows valve (F, G & H only).
6.
Spindle retainer for bellows valve.
7.
Base studs for bellows valve (D, E, F & G
only).
8.
Machine existing lower spring washer. (See
Paragraph XV.B. and Figure 43 for F, G & H
orifices only.) Upper spring washer, no
change.
9.
Drill 23/32 dia. on bonnet boss and tap 1/2
N.P.T. (as required).*
1.
Bellows Assembly - Standard Material, AISI
316L Stainless Steel.
2.
Set of gaskets for bellows valve.
3.
Drill 23/32 dia. on bonnet boss and tap 1/2
N.P.T. (as required).*
4.
Studs (1905-30 K & L, 1906-30 K & L only).
1.
Bellows Assembly - Standard Material AISI
316L Stainless Steel
2.
Set of gaskets for bellows valve.
3.
Guide for bellows valve.
4.
Disc holder for bellows valve.
5.
Drill 23/32 dia. on bonnet boss and tap 1/2
N.P.T. (as required).*
6.
Studs (1905-30 N & P, 1906-30 N & P only).
1.
Bellows Assembly
2.
Set of gaskets for bellows valve
3.
Guide for bellows valve
4.
Lift restricting ring
5.
Studs
1.
Eductor tube for conventional valve.
2.
Set of gaskets for conventional valve.
3.
Guide for conventional valve.
4.
Disc holder for conventional valve.
5.
Spindle for conventional valve (F, G & H
only).
6.
Spindle retainer for conventional valve.
7.
Base studs for conventional valve (D, E, F &
G only).
8.
New lower spring washer for conventional
valve. (See Paragraph XV.C. and Figure 44
for F, G & H orifices only.) Upper spring
washer, no change.
9.
Bonnet vent plugged (if desired).
1.
Eductor tube for conventional valve.
2.
Set of gaskets for conventional valve.
3.
Bonnet vent plugged (if desired).
4.
Studs (1905 K & L, 1906 K & L only).
1.
Eductor tube for conventional valve.
2.
Set of gaskets for conventional valve.
3.
Bonnet vent plugged (if desired).
4.
Drill 7/16 dia. thru guide flange 1-13/16 from
guide bore centerline (J orifice only).
5.
Studs (1905 N & P, 1906 N & P only).
1.
Set of gaskets for conventional valve
2.
bonnet vent plug (if desired)
K, L, M, Q
R, T
**Also J, N, P
manufactured
after 1981
J, N, P
**Manufactured
prior to
1982
W
TABLE 19
* Valves manufactured after 1980 are furnished with bonnet vent machined.
** J, N, P orifice valves manufactured after 1981 are furnished with threaded disc holder and reduced guide
bore for balanced bellows conversion.
VALVE ORIFICE
SIZE
D, E, F, G, H
