Honeywell SV2 Series User Manual page 23

SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
Valve Body
The valve body is symmetrical on both sides; there are markings molded into the casting including a gas flow directional arrow,
valve seat 1 and 2 markings, pressure port access markings (A, B, C, D) and guide posts for mounting to the pressure access
ports. Also, each body has threaded holes to affix the electrical enclosure and modules in place. Valve bodies that are ordered
from the factory with NPT port threads have an appropriately sized NOVV (normally open vent valve) connection on each side.
Valve bodies ordered with BSP port threads do not have NOVV connections.
Additionally, each side of the valve body has a ground connection to which the chassis ground wire is connected.
The valve body symmetry lends itself to flexible valve orientation and installation. From the factory, each valve must be ordered
as either right-hand or left-hand valve/electronics orientation as viewed from the gas outlet end (refer to digit #10 from Fig.
1 Valve nomenclature). Accordingly, the valve electronics enclosure is mounted per the order specification along with side-
specific chassis ground wiring, solenoid 1/2 wiring, valve seat 1/2 open/closed LED association and proof of closure 1/2
wiring. As required in the factory or field, these items may be re-oriented to the opposite side of the valve. Refer to CHAPTER 10:
CHANGING VALVE / ELECTRONICS ORIENTATION in this document for detailed instructions on performing this procedure in
the field.
Pressure Access Locations
Each side of the valve body has two (2) pressure access locations, with a total of four (4). The pressure access locations are
labeled as A, B, C and D. Locations A and B reside on one side of the valve body under valve seats V1 and V2, respectively.
Locations C and D reside on the other side of the valve body under valve seats V1 and V2, respectively. Since the valve body is
symmetrical, locations A and C under valve seat V1 and are identical to each other and locations B and D under valve Seat 2 are
identical to each other.
Pressure access locations A, B C and D each contain three (3) pressure access ports with plugs, which access pressure
measurement locations at various points in the valve anatomy and are used for various purposes. The pressure access ports on
locations A and C under valve seat V1 are identical. The same is true for pressure access ports on locations B and D under valve
seat V2. Refer to Table 5 and Fig. 15 and Fig. 18.
For shipment from the factory, covers are added to the four pressure access locations (A, B, C and D) to prevent damage or entry
of foreign objects. Refer to Fig. 15. Before mounting a Pressure Module in the field or using a port for pressure measurement,
the appropriate cover will need to be removed. Follow the detailed directions provided in the associated accessory installation
instructions.
Note that pressure measurements may also be taken via the pressure access ports on the inlet and/or outlet flanges.
Table 5 shows all of the possible pressure access/tap locations on each side of the valve and usages for each. Also refer to
Fig. 16 and Fig. 18. Each pressure access/tap location on the valve body is either 1/8 in (3mm) NPT or BSP, depending on which
port thread is ordered from the factory. Refer to Fig. 1 Valve nomenclature for further information. Digit # 6 in the valve model
identifies the port thread type.
The flange pressure taps are 1/8-27 in (3mm) if an NPT flange is ordered or 1/8-28 in (3mm) if a BSP flange is ordered from the
factory.
SV2 Series Safety Shut-off Valves 23
V2F, V2V