2 | Dresser
Materials of Construction
Body & Spring Case ASTM A 216 WCB Carbon Steel
Spacer ASTM A 216 WCB Carbon Steel
Throttle Plate 17-4PH Stainless Steel
Diaphragm Nitrile/Nylon Optional (Viton/Nitrile)
O-Ring & Seals Nitrile Optional (Viton)
Bolting ASTM 193 GR B-7 or Equal
Spring 301 Stainless Steel
Specifications
Sizes 1inch thru 12 inch
Body Style Single Port and Dual Port
End Connections Screwed, Socket Weld
Flanged, Flangeless & Buttweld
Temperature* -20°F to 150°F
(-29°C to 66°F)
Maximum Operating
Differential
800 psi
Maximum Emergency
Differential
1000 psi (unless limited by body rating)
Minimum Differential Refer to individual product specification
sheets
Cracking Differential Refer to individual product specification
sheets
Maximum Inlet Pressure 1480 psig (limited by flange or pilot
rating)
Outlet Pressure Range Limited by pilot
Flow Direction Bi-Directional*
Body Taps 1/4” - 18 NPT
*Reverse flow by changing pilot connections and reversing spring case.
Table 1 Table 2
Figure 1
The throttle plate (2) supports the diaphragm and provides
a machined surface that the diaphragm seals against for
bubble tight shutoff. Restricted capacity plates of 35%, 50%,
and 75% are available.
The spacer (3) creates a space between the throttle plate
and the diaphragm which forms a flow path inside the valve.
The fabric-reinforced diaphragm (4) is the main working
part of the Flowgrid
®
valve. The diaphragm functions as both
an actuator and the valve throttling element.
It is designed to provide stability, rangeability, and fast
response without stretching. It will not “take a set” and is
thick for durability and wear resistance.
The main spring (5) provides high frequency response,
proportional action for stability and a consistent minimum
differential regardless of temperature. It also provides a
positive closing force, which is important in monitor regulation
application.
The spring case (6) is shaped to retain the main spring. It
provides a low volume cavity where loading pressure from the
pilot system is placed on top of the diaphragm to control flow
through the regulator.
3
1
4
2
5
6
Figure 2
Figure 3
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