Sequence assembly, with reverse flow check

Function

Function for YQHA
Port Designators [ + ]
Modifiers Ports
D, D/S Ports 1 & 2: 3/4" NPTF; Port 3: 1/4" NPTF; Gage Port: 1/4" NPTF;
E, E/S Ports 1 & 2: 1" NPTF; Port 3: 1/4" NPTF; Gage Port: 1/4" NPTF;
F, F/S Ports 1 & 2: 1 1/4" NPTF; Port 3: 1/4" NPTF; Gage Port: 1/4" NPTF;
L, L/S Ports 1 & 2: SAE 12; Port 3: SAE 6; Gage Port: 1/4" NPTF;
M, M/S Ports 1 & 2: SAE 16; Port 3: SAE 6; Gage Port: 1/4" NPTF;
N, N/S Ports 1 & 2: SAE 20; Port 3: SAE 6; Gage Port: 1/4" NPTF;
P, P/S Ports 1 & 2: 1" Code 61; Port 3: SAE 6; Gage Port: 1/4" NPTF;
P/M, P/T Ports 1 & 2: 1" Code 61; Port 3: 1/4" BSPP; Gage Port: 1/4" BSPP;
Q, Q/S Ports 1 & 2: 1 1/4" Code 61; Port 3: SAE 6; Gage Port: 1/4" NPTF;
Q/M, Q/T Ports 1 & 2: 1 1/4" Code 61; Port 3: 1/4" BSPP; Gage Port: 1/4" BSPP;
W, W/S Ports 1 & 2: 3/4" BSPP; Port 3: 1/4" BSPP; Gage Port: 1/4" BSPP;
X, X/S Ports 1 & 2: 1" BSPP; Port 3: 1/4" BSPP; Gage Port: 1/4" BSPP;
Y, Y/S Ports 1 & 2: 1 1/4" BSPP; Port 3: 1/4" BSPP; Gage Port: 1/4" BSPP;
Technical Features [ + ]

This assembly consists of a pilot-operated, balanced piston kick-down sequence valve that will kick completely open and remain open once the pressure at the inlet (port 1) exceeds the valve setting, creating an unrestricted flow path from port 1 to port 2 (sequence). The pressure setting at port 1 is relative to the drain (port 3). The valve remains open as long as the pressure at port 1 exceeds the pressure at port 2. To reset the valve, pressure at port 1 must fall below the setting of the valve, flow from port 1 to port 2 must cease, and pressure at port 2 must be equal to or greater than the pressure at port 1. Additionally a reverse flow check allows free flow from port 2 to 1.

  • Should not be used in load holding applications.
  • Intended for use on the actuator side of the system as flow through the valve must cease for the valve to reset. If used on the pump side of a system, pump flow must be shut off for the valve to reset.
  • Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
Technical Data [ + ]
Body Type Line mountLine mount
Capacity 60 gpm240 L/min.
FAQs [ + ]

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

Notes [ + ]
  • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
Additional Resources [ + ]