SERIES 21
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SERIES 21 __ High-Temperature and Low-Temperature ServiceSeries 21 valves are configured like the Series 27 valve on the previous page, but are designed with metal internals and special seals appropriate for use in more extreme temperatures. The valves are designated as either Type H (high temperature) or Type O (low temperature) valves. Temperature specifications for the two types are given below. |
3/2 Valve with Single Solenoid Pilot- Metal override button on top of pilot is standard on all single solenoid models.
| Type H (High Temperature) Service |
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| Fluorocarbon seals are used to ensure high temperature stability. ■Ambient Temperature: Up to 250°F(122℃) for solenoid models;up to 300°F(150℃) for pressure controlled models. ■Media Temperature: 0°to 300°F (-17°to 150℃). |
| Type O (Low Temperature) Service |
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| Buna N swals are used to ensure good performance at low temperatures. ■Ambient Temperature: Down to -40°F (-40℃). ■Media Temperature: -40°to 175°F (-40°to 80℃). |
| Vacuum Service |
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| The construction of Series 21 valves makes them readily adaptable to vacuum service. For details consult your ROSS distributor or ROSS Technidal Services. The telephone number for Technical Services in the U.S.A. is 1-888-TEK-ROSS (835-7677) or 1-706-356-3600. |
SERIES 21 VALVE BODIES
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Although their internals are constructed differently from the Series 27 valves, all five of the of types shown on page 53 are available in Series 21. A3/2 normally closed type is shown at the right.
O-ring piston seals have Teflon ® wear rings top and bottom. Inlet and exhaust poppets have spun-in O-ring seals. |
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