Daniel Series 500 Power Cylinder Operated Control Valves
These valves are ideal when minimum pressure drop is required or for applications where the flowing stream can't be used as the power medium to operate a valve. The externally controlled main piston and the 45 degree body design assures extreme, low pressure drop.
Standard power cylinders are designed to operate on 30 psi (207 kPa) minimum for full stroke and are limited to a maximum pressure of 150 psi (1034 kPa). An optional power cylinder for 15 psi (103 kPa) full stroke is available, but limited to selected applications that can tolerate a small leakage of the power cylinder operator pressure medium to atmosphere or sump.
The power cylinder may be operated either pneumatically or hydraulically with electric, pneumatic or hydraulic pilot valves used to control application or removal of pressure from the cylinder.
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- Fail safe on loss of power medium
- Modular construction - all internal parts including seat ring can be removed with the cylinder assembly without disturbing line connections
- No diaphragms or stuffing boxes
- Linear control characteristics
- Positive shut-off
- Bi-directional flow
- 45 degree body design assures high capacity fluid
- Extremely low pressure drop
- Atmospheric vent positively prevents mixing of line fluid and power cylinder operating fluid
Materials of construction
- Main valve:
- Main valve body: Steel - ASTM-A-216-GR-WCB
- Main valve cylinder:
- 2-6" Ductile iron, nickel coated
- 8-12" Steel, nickel coated
- Main valve piston:
- Bronze standard on 150 and 300 lb. valves
- Stainless Steel Optional
- Stainless Steel standard on 600 lb. valves
- Seat ring: Stee1,Nickel Coated (Stainless Steel-600 lb. valves)
- O-Rings: Standard - Buna-N
- Other O-rings available are Nitrile, EPR, all Viton, all Buna-N, Kalrez, Teflon
- Other internal parts: Stainless steel
- Power cylinder operator:
- Power cylinder: Ductile iron, nickel coated ASTM - 395
- Power cylinder piston: Anodized aluminum
- Other power cylinder internal parts: Steel and stainless steel
- Tank safety remote on-off control
- Bypass control on distribution system
- Emergency shut-off on loading and unloading lines
- Two-stage and digital batch control
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