CVS 7970 Instruction Manuals

CVS 7970 Instruction Manuals

High-low pressure pilot

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Instruction Manual
CVS 7970
High-Low Pressure
Pilot

Introduction

This instruction manual includes the following
information for CVS 7970 High-Low Pressure Pilot:

1. Description

3. Parts Information
Only persons qualified through training or experience
should install, operate and service this equipment. If
you have any questions regarding this product or this
manual, please contact your CVS Controls Sales
Representative before proceeding.
Description
The CVS 7970 is a versatile sensor that can be
programmed to detect and react to either increasing
pressure or decreasing pressure with an adjustable
range of 2 to 10,000 PSI (.138 to 689.5 bar).
When used within standard safety systems, a
pressure sensor monitors a specific media or
process pressure source for changes to the normal
operating range. Loss of pressure within the control
circuit will begin a shutdown sequence or trigger an
alarm, and pressure sensors can also indirectly
operate on/off flow control valves or pneumatic
driven pumps.
The CVS 7970 is a two position, three-way pilot with
universal ports (H, O, L), automatic reset (spring
return) and pressure balance spool.
Head Office
3900 – 101 Street
Edmonton, Alberta, Canada T6E 0A5
Office: (780) 437-3055
Fax: (780) 436-5461
Website: www.cvs-controls.com
Figure 1: CVS 7970 High-Low Pressure Pilot
Each CVS 7970 is a self-contained unit containing
necessary components for four different piston
arrangements. Changeover instructions and
drawings are included in this manual. Parts which
are not installed in your current piston arrangement
are kept in an enclosed storage tube. Machined
within the piston housing of the CVS 7970 is a
convenient 1/8"–27 NPT Female process connection
and 1/2" NPT Male process connection.
E-Mail: info@cvs-controls.com
Calgary Sales Office
3516 114 Avenue SE
Calgary, Alberta, Canada T2Z 3V6
Office: (403) 250-1416
Fax: (403) 291-9487

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Summary of Contents for CVS 7970

  • Page 1 CVS Controls Sales Representative before proceeding. Description The CVS 7970 is a versatile sensor that can be programmed to detect and react to either increasing pressure or decreasing pressure with an adjustable Figure 1: CVS 7970 High-Low Pressure Pilot range of 2 to 10,000 PSI (.138 to 689.5 bar).
  • Page 2 M=Male, F=Female Introduction continued 4. Loosen the lock nut and remove from the One particular advantage of the CVS 7970 is its adjusting cap. (See figure 2) adjustment range capability. Because of the 5. Gently relieve all spring tension by fully complete supplied components, there is no need to unscrewing the adjusting cap.
  • Page 3 Figure 2: Adjusting Cap / Storage Tube Access CVS 7970 High-Low Pressure Pilot Table 2: Parts List Part Number Qty. Description Material CVS79710A Adjusting Cap Black Delrin CVS79702A 5/16” Ball Bearing Stainless Steel CVS7911A Spring Guide Black Delrin CVS7970A Spring...
  • Page 4 Figure 3: CVS 7970 High-Low Pressure Pilot Assembly...
  • Page 5 Part Number Qty. Description Material CVS79703A Small Piston 316 Stainless Steel CS79702 Large Piston 316 Stainless Steel CVS797014 Snap Ring 304 Stainless Steel V-75-119 Seal Viton Coated TFE TFE-008 Back-Up Ring Teflon V-75-008 Seal Viton Coated TFE Figure 4: 3/16 Piston Arrangement Enlarged Detail Drawing For pressures from 5900 to 10,000 PSI (407 to 690 bar) Part Number Qty.
  • Page 6 Part Number Qty. Description Material CVS79703A Small Piston 316 Stainless Steel CS79702 Large Piston 316 Stainless Steel V-75-119 Seal Viton Coated TFE TFE-012 Back-Up Ring Teflon V-75-012 Seal Viton Coated TFE Figure 6: 1/2” Piston Arrangement Enlarged Detail Drawing For pressures from 290 to 1440 PSI (20 to 99 bar) Part Number Qty.
  • Page 7 Figure 8 – CVS Series 7970 Low Pressure Pilot – Adjustment 2 to 15 PSI, Assembly CVS Series 7970 Low Pressure Pilot – Adjustment 2 to 15 PSI, Parts List Item Number Part Number Description Qty. CVS 7910A Adjusting Cap, Black Delrin CVS 7920A 6/16"...
  • Page 8 Figure 9: CVS Series 7970 High-Low Pressure Pilot Switch Low Pilot High Pilot High Pilot Low Pilot Hi-Low Pressure Pilot - Manual Reset Low Pressure Valve: *Out Port To Valve *Hi Port To Vent High Pressure Valve: *High Port To (air/gas) Supply (Max Supply Pressure 125 psi)
  • Page 9 Instructional Schematic: Pressure Sensing Low – Decreasing (PSL) Normally Closed – Loss of Instrument (output) pressure, when sensed inlet pressure decreases below the low pressure setting. Reducing Pressure Inlet Pressure Absent Unactuated - Monitored process control pressure has DECREASED below the Low Pressure Setting, or is absent. Gaining Pressure Inlet Pressure Applied Actuated - Monitored process control pressure has...
  • Page 10 Instructional Schematic: Pressure Sensing High – Increasing (PSH) Normally Open – Loss in Instrument (output) pressure, when sensed inlet pressure increases above the high pressure setting. Gaining Pressure Inlet Pressure Applied Unactuated - Monitored process control pressure is applied, but is BELOW the high pressure setting. Normal operation. Reducing Pressure Inlet Pressure Applied Actuated –...
  • Page 11 Notes:...
  • Page 12 CVS Controls Ltd. strives for the highest levels of quality and accuracy. The information included in this publication is presented for informational purposes only. CVS Controls Ltd. reserves the right to modify or change, and improve design, process, and specifications without written notice.

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