Robertshaw 83939-D Series User manual

1
Sales Manual Section 332
PRODUCT SPECIFICATION PS 83939-D
High Capacity Relay
with Internal Orifice
83939-D Series
GENERAL DESCRIPTION
The 83939-D Series is a high capacity, two-position,
four-ported, 3-way, normally closed
diaphragm-actuated relay. This relay will supply
pressure from Port S to Port C when the actuating
diaphragm is pressurized. When the relay is in the
closed position, it will vent downstream pressure.
These relays have no transient position which allows
Ports S, C, and V to all be connected; i.e., before Ports
S and C are connected, Port V will be closed, and
likewise, before Ports V and C are connected, Port S
will be closed.
SPECIFICATIONS
Construction: Aluminum body; stainless steel cover,
bracket and springs; elastomer coated fabric
diaphragms and gaskets; stainless steel and
aluminum valve with resilient seat.
Supply Pressure: ......................................See Figure 3
Maximum Pressure: ................................See Figure 3
CAUTION: DO NOT EXCEED MAXIMUM
PRESSURES.
Mounting: .........................................................Surface
Dimensions: .............................................See Figure 1.
Models Available:
Connections: .................................................... 1/4"-18 NPT
Approximate Shipping Weight: ....................2 lb. (.907 kg.)
ORDERING INFORMATION:
Specify Model Number
83939
-
D21
,
D31
83939
-
1322
,
D32
'AIR OR GAS
83939-D23, D33
J. I. C. Symbols
Form No. P-2316 (Rev. B)

2
INSTALLATION
A. General
Tubing and fittings used to connect the relay must
be free of chips, dirt, and moisture or other
foreign material.
It is recommended that an "anti-seize" type thread
compound be applied to the second or third male
thread in moderate amount. Do not allow
compound to be deposited inside the relay. Thread
sealing tape is not recommended.
For continuous, trouble-free operation, the supply
to the relay must be clean and dry.
DIMENSIONS
B. Mounting
When installing the No. 83939-D Series Relay,
care should be taken to prevent any foreign matter
from entering the ports. Provisions should be
made to prevent foreign matter from entering the
ports which are left open to the atmosphere.
The relay may be installed in any position, but
vertical (upright) is recommended. The relay
should be securely mounted, using the two slots
(clearance for No. 10 screws), provided in the
mounting bracket (See Figure 1).
Fi
g
ure 1
OPERATION
With no pressure applied to the diaphragm through
Port 1, Port C is connected through a hollow stem to
Port V while closed to Port S (supply port).
When sufficient pressure is applied to the diaphragm
through Port 1, the hollow stem moves down, closing
Port C to Port V. As the hollow stem moves farther, it
forces the lower poppet down opening Port S to Port
C.
Loss of the pressure at Port 1 will allow the hollow
stem to return to its original position. This allows the
spring and the supply pressure to push the lower
poppet to its original position. Port S is now closed to
Port C while Port C is connected to Port V.
The 83939-D22 and 83939-D32 have an internal
orifice assembly which connects Port 1 to Port C.
The 83939-D23 and 83939-D33 have an internal
orifice assembly which connects Port 1 to Port S.
Fi
g
ure 2

3
PORT S
CAUTION: DO NOT EXCEED MAXIMUM PRESSURES.
Figure 3
MAINTENANCE
WARNING: Disassemble carefully - spring load
forces present.
A. If excessive leakage occurs at valve seat, remove
bottom cover. Clean poppet and seat with soft, dry
cloth (See Figure 4).
B. If relay does not function properly due to
contamination by foreign matter, disassemble and
clean all metal parts with non-flammable solvent
and dry thoroughly.
C. The orifice is removable by applying pressurized
air to Port I. WARNING: The pressure should be
initially applied at 3 psi (20.7 kPa) and slowly
increased to a maximum of 30 psi (206.8 kPa).
Care must be exercised to prevent the orifice from
being ejected in a manner which would be
injurious to personnel. Clean with a small diameter
wire and pressurized air. In removal or
replacement of orifice, care must be exercised not
to nick or scratch sealing surfaces. "O" ring must
be inserted into relay body before orifice.
D. After reassembly, check for external leakage.
Retighten assembly screws as necessary. Gasket
cement should not be used to seal leaks due to the
possibility of plugging small passages or
damaging the operating characteristics of the
diaphragms.
CAUTION:
If cleaning is required, do not subject "O" rings, valve
poppets, diaphragms or gaskets to cleaning fluid,
acetone or any halogenated hydrocarbons such as
vapor degrease liquids, etc. Clean only with a soft, dry
cloth.
Upon reassembly, all "O" rings are to be lubricated
with a silicone-type lubricant. Do not permit lubricant
to get on poppet or valve seats.
NOTE: Graph below indicates actuating pressure (Port 1)
required to operate valve at various supply
p
ressures
(
Port S
)
.
Fi
g
ure 5
Fi
g
ure 4

4
NOTE: For complete kit containing all 'O" Rings,
gaskets, diaphragms and poppet to service
one unit, order Repair Wt No. 82665-82.
Q-4056 (5/01) Printed in U.S.A.
PARTS LIST
DET.
NO.
NO.
REQ 'D DESCRIPTION DRAWING NO.
1 1 Mounting Bracket 24637-A4
2 2 Screw 36618-E1709
3 2 Cover 33666-B1
4 1 Diaphragm 24498-C1
5 1 Spring 24616-A1
6 1 Spring Seat 33669-B1
7 1 O-Ring 36240N2012
8 1 Spring 33668-Al
10 1 Orifice See Tabulation
11 6 Screw 36618-E1509
12 1 Gasket 33665-C1
13 1 Plug Guide 24607-B 1
14 1 Plug Assembly 84980-B1
15 1 Relay Body 31857-Fl
16 1 Head & Stem Assembly 85013-D1
17 1 Spacer 33430-C1
18 1 Gasket 33665-D1
19 8 Washer 36600L0909
20 1 Decal 35173-B1
21 1Nameplate 30036-G2
* Detail 12 should be assembled as shown in Figure 5.
TABULATION
ASSEMBLY NO. DET.10
83838-D21
83838-D22
83838-D23
31311-F3
83838-D31
83838-D32
83838-D33
31311-F4
PARTS LIST