Description
Watson McDaniel 10691 Series — Relief & Back Pressure Regulating Valve for Water, Oil, and Other Liquids
The 10691 Series Relief and Back Pressure Regulating Valves are designed to relieve upstream pressure in liquid systems by maintaining maximum allowable pressure and discharging excess fluid to a lower-pressure line or to atmosphere. These valves are widely used as pump bypass valves to maintain constant pump discharge pressure and as overpressure protection devices. The 10691 Series includes a soft elastomeric disc for tight shut-off and reliable performance.
Product Overview
- Direct-operated relief and back pressure regulating valve for water, oil, and other liquids
- Automatically relieves excess upstream pressure to protect system components
- Suitable for pump bypass applications and continuous service pressure relief
- EPDM, Teflon, or Viton disc options for media compatibility
- Compact bronze body design for long service life
Caution
NOT to be used as an emergency or safety relief valve.
NOT to be used on steam.
Technical Specifications
- Body Material: Bronze
- Disc Options: EPDM (Standard), Teflon, or Viton
- Connection: Threaded NPT
- Available Sizes: 1/2″, 3/4″, 1″
- Maximum Inlet Pressure: 300 PSIG
Available Models — EPDM Disc (Standard)
| Size | Model Code | Relief Pressure Range (PSIG) | Weight (lb) |
|---|---|---|---|
| 1/2″ | 10691-12-N-3-E | 5–35 | 1.5 |
| 1/2″ | 10691-12-N-2-E | 25–100 | 1.5 |
| 1/2″ | 10691-12-N-1-E | 75–300 | 1.5 |
| 3/4″ | 10691-13-N-3-E | 5–35 | 2.5 |
| 3/4″ | 10691-13-N-2-E | 25–100 | 2.5 |
| 3/4″ | 10691-13-N-1-E | 75–300 | 2.5 |
| 1″ | 10691-14-N-3-E | 5–35 | 3.3 |
| 1″ | 10691-14-N-2-E | 25–100 | 3.3 |
| 1″ | 10691-14-N-1-E | 75–300 | 3.3 |
Available Models — Teflon Disc
| Size | Model Code | Relief Pressure Range (PSIG) | Weight (lb) |
|---|---|---|---|
| 1/2″ | 10691-12-N-3-T | 5–35 | 1.5 |
| 1/2″ | 10691-12-N-2-T | 25–100 | 1.5 |
| 1/2″ | 10691-12-N-1-T | 75–300 | 1.5 |
| 3/4″ | 10691-13-N-3-T | 5–35 | 2.5 |
| 3/4″ | 10691-13-N-2-T | 25–100 | 2.5 |
| 3/4″ | 10691-13-N-1-T | 75–300 | 2.5 |
| 1″ | 10691-14-N-3-T | 5–35 | 3.3 |
| 1″ | 10691-14-N-2-T | 25–100 | 3.3 |
| 1″ | 10691-14-N-1-T | 75–300 | 3.3 |
Available Models — Viton Disc
| Size | Model Code | Relief Pressure Range (PSIG) | Weight (lb) |
|---|---|---|---|
| 1/2″ | 10691-12-N-3-V | 5–35 | 1.5 |
| 1/2″ | 10691-12-N-2-V | 25–100 | 1.5 |
| 1/2″ | 10691-12-N-1-V | 75–300 | 1.5 |
| 3/4″ | 10691-13-N-3-V | 5–35 | 2.5 |
| 3/4″ | 10691-13-N-2-V | 25–100 | 2.5 |
| 3/4″ | 10691-13-N-1-V | 75–300 | 2.5 |
| 1″ | 10691-14-N-3-V | 5–35 | 3.3 |
| 1″ | 10691-14-N-2-V | 25–100 | 3.3 |
| 1″ | 10691-14-N-1-V | 75–300 | 3.3 |
Options & Adders
- Factory Set Pressure Option: Add $100.00 (specify set pressure when ordering)
- Disc Material Options: EPDM (Standard), Teflon, Viton
Note: The 10691 Series is designed only for liquid service and must not be used on steam applications.